Abstract
Background: Patients with advanced non-malignant diseases experience pain, dyspnoea and fatigue, requiring a rehabilitation approach within palliative care.
Aim: To identify components of non-pharmacological interventions for symptom self-management for patients with non-malignant chronic disease.
Method: This scoping review identifies: (1) systematic reviews of symptom self-management interventions for breathlessness, pain and fatigue in chronic lung, heart, renal and liver disease; (2) primary studies in low- and middle-income countries to identify intervention components, contextual factors, facilitators and barriers to symptom self-management. Six databases were searched, records exported to Rayyan and deduplicated. Following screening for inclusion, extraction was conducted. We conducted a narrative synthesis of intervention components and implementation factors, and content analysis of barriers and facilitators to interventions.
Results: Thirty-one articles were included (21 systematic reviews and 10 primary studies). The populations studied had chronic lung disease (n = 19), heart disease (n = 12), chronic renal disease on dialysis (n = 2) and none had hepatic disease. The three most common intervention components were information, training and rehearsal for practical self-management activities and lifestyle support. Common patient barriers included motivation, adherence and health literacy, while facilitators encompassed knowledge, support and family involvement. The availability of healthcare workers can impact implementation, but remote access options should be considered.
Conclusion: Disease and management information for patients and their family members, along with support for home application, form the foundation for effective symptom self-management.
Contribution: Symptom self-management for non-malignant chronic diseases is uncommon in low-resource settings. This review outlines the necessary components and implementation considerations.
Keywords: symptoms; self-management; pain; dyspnoea; fatigue; non-pharmacological; chronic disease; palliative care; rehabilitation.
Introduction
Palliative care aims to enhance the quality of life for patients and families experiencing serious health-related suffering.1 Nevertheless, the integration of palliative care into primary health care has been particularly slow in low- and middle-income countries (LMICs).2 This is especially concerning given the rising prevalence of non-communicable diseases (NCDs) within these regions, which are associated with reduced quality of life over the trajectory of chronic disease and increased use of emergency services because of uncontrolled symptoms.3,4,5 Three-quarters of patients in need of palliative care globally live in LMICs; the majority of these have NCDs and less than 10% receive the palliative care they need.6 A significant challenge in LMICs is the limited availability of palliative care that is integrated across various healthcare disciplines. Alongside clinical care and support, there is a need and opportunity to support patient self-efficacy7 and to reduce reliance on the healthcare system, particularly emergency care, for symptom management. Palliative rehabilitation encompasses interventions aimed at managing symptoms, enhancing comfort and promoting independence for as long as possible.1 Reviews of the evidence for self-management interventions have shown their benefit in improving self-efficacy, health-related quality of life, depression and anxiety for patients with chronic kidney disease,8 and in improving dyspnoea, health-related quality of life and reducing hospital admissions in patients with chronic obstructive pulmonary disease (COPD).9 Although rehabilitation services are inherently aligned with the objectives of palliative care, there is a notable lack of integrated practice between these fields in LMICs, and particularly limited access to these professional services for symptom self-management at the primary care and community level.5 This gap highlights an urgent need to identify effective rehabilitation strategies which can be employed within palliative care provision to improve the quality of life for patients with non-communicable illnesses.
This approach necessitates flexibility and the continual adaptation of care goals in response to changes in a patient’s condition. Traditionally, palliative rehabilitation is delivered by qualified professionals such as occupational therapists, physiotherapists, speech and language therapists, and dietitians. Common symptoms managed within palliative rehabilitation include fatigue, dyspnoea and pain. However, in LMICs, these skilled professionals are scarce, particularly at the community level. As a result, alternative models of delivery must be developed to ensure that patients and their families have access to rehabilitation that supports symptom management. A definition of symptom self-management interventions is provided by Jonkman et al.:10
Self-management interventions aim to equip patients with skills to actively participate and take responsibility in the management of their chronic condition in order to function optimally through at least knowledge acquisition and a combination of at least two of the following: stimulation of independent sign/symptom monitoring, medication management, enhancing problem-solving and decision-making skills for medical treatment management, and changing their physical activity, dietary, and/or smoking behaviour. (p. 35)
This scoping review is part of a wider project to develop and investigate the acceptability and feasibility of symptom self-management intervention for pain, breathlessness and fatigue for people living with chronic organ failure in South Africa. As part of the intervention development, this review aimed to identify the active components of non-pharmacological interventions for symptom self-management for patients with advanced non-malignant chronic lung, heart, renal and liver disease, specifically for the symptoms of breathlessness, pain and fatigue. Additional objectives included identifying the barriers to and facilitators of symptom self-management, and the contextual factors influencing symptom self-management in LMICs.
Methods
A scoping review utilising two searches was conducted according to guidance by Peters et al.11 The first search identified systematic reviews which document the active components of interventions to support symptom self-management for the symptoms of breathlessness, pain and fatigue in advanced chronic lung, heart, renal and liver disease. The second search identified primary studies conducted in LMICs in order to identify specific contextual facilitators and barriers to symptom self-management in LMICs. We defined the term ‘advanced non-malignant chronic disease’ as referring to advanced disease which is deteriorating despite the best available medical management.12,13,14,15,16,17,18,19,20 Eligibility criteria are detailed in Table 1.
Search strategy and study selection
The search strategies were informed by methodological guidance on scoping reviews11 and drew on our previous review of symptom self-management interventions for people living with human immunodeficiency virus (HIV).22 For both searches, we used the following databases: Medline via PubMed; EBSCOhost for Academic Search Premier, Africa-Wide Information, CINAHL, ERIC, Health Source: Nursing/Academic Edition, APA PsycArticles, APA PsycInfo and SocINDEX; Scopus; Web of Science: Core Collection and SciELO only; and the Cochrane Library of Systematic Reviews, and Cochrane Register of Controlled Trials (CENTRAL). The search terms were guided by the scoping review concept of inclusion based on population, concept and context (PCC).23 Search one was conducted in February 2023 and updated on 04 November 2024. Search terms included (1) terms relating to chronic disease or end-stage disease or specifications for cardiac, hepatic, respiratory and renal disease; (2) terms relating to self-management and (3) terms relating to symptoms. Search two was conducted in June 2023 and updated on 11 November 2024. These search terms included (1) and (2) from search one and terms relating to LMICs. The groups of terms for both searches were combined using the Boolean Operator AND. For both searches, medical subject headings and keyword terms were used for exploring synonyms and a record was kept of all search terms and the results of all searches. The search strings for both searches that were used for PubMed are included in Online Appendix 1.
Screening and study eligibility selection
All references were exported to EndNote. Once all database searches were complete, references were exported to Rayyan24 and duplicates were removed. Inclusion and exclusion selection were piloted by N.N., S.N. and L.F. with a sample of references to guide the subsequent screening process of titles and abstracts and full texts. A double-blind review was performed for half of the screened articles. Disagreements were discussed, and where uncertainty remained, N.N., H.B. and M.M. provided a third reviewer decision. The screening and selection process was captured on a Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) flow chart.25
Data extraction
Extraction for search one and search two used the same template. Contextual implementation factors were extracted for only the LMIC primary studies, using the first three domains of the (updated) Consolidated Framework for Implementation Research (CFIR).26,27 The data extraction template was reviewed ahead of extraction. Extraction was piloted by S.N., L.F., K.v.P., N.N. and H.B. The extraction spreadsheet was refined, and double-blind extraction was conducted. The extraction process included the following elements: first author, year, country, study setting, population, intervention descriptors (including intervention components, providers, number and duration of contact sessions, and duration of the intervention programme), identified implementation barriers and facilitators, and contextual factors. In cases where systematic reviews included studies with populations or symptoms not covered in this review, only the relevant disaggregated study populations and symptoms were extracted.
Data synthesis
Narrative synthesis of the data considered intervention descriptors, intervention components, outcome measures and contextual factors. Intervention components were assessed and classified according to the Practical Reviews In Self-Management Support (PRISMS) taxonomy of self-management support28 (Table 2), each by two of four independent researchers (H.B., L.F., O.G. and M.M.). Content analysis of the factors relating to the barriers and facilitators of symptom self-management was conducted by two reviewers (H.B. and L.F.), categorising these to guide descriptive understanding.29 Narrative synthesis was conducted for the CFIR outer and inner domains.26,27 Outer setting considerations include patient needs, available resources and the extent of effective organisational linkages, while the inner setting refers to the structure, culture and communication within organisations leading the intervention.30
| TABLE 2: Practical reviews in self-management support taxonomy of symptom self-management. |
Ethical considerations
Ethical clearance to conduct this study was obtained during the intervention development phase of the Global Health and Palliative Care (GHAP) project at the University of Cape Town, Faculty of Health Sciences Human Research Ethics Committee (HREC REF: 317/2023). The protocol was prospectively registered with the Open Science Framework (OSF) Registries (https://doi.org/10.17605/OSF.IO/N4R87).
Results
In total, 31 articles were included across the two searches. Search one identified 174 articles after deduplication, and 21 systematic reviews met the eligibility criteria (Figure 1). Search two (Figure 2) yielded 3740 articles after deduplication, with 10 primary studies meeting the eligibility criteria. Figure 1 presents the PRISMA flow chart for search one and Figure 2 for search two.
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FIGURE 1: Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow chart for search one. |
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FIGURE 2: Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow chart for search two. |
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Characteristics of included articles
Six systematic reviews included relevant studies conducted only in high-income countries (HIC)31,32,33,34,35,36; four systematic reviews did not state the countries of included studies9,37,38,39 and 11 systematic reviews included relevant studies extracted from HICs and LMICs. The LMICs represented in the systematic reviews were Brazil,40,41,42 China,40,42,43,44,45,46,47 India,42,48 Indonesia,42 Iran,41,46,49 Thailand49 and Turkey.41 The included primary studies were conducted in China,50,51,52 Colombia,53 India,54 Iran,55,56 Nepal,57 Thailand58 and Turkey.59 No sub-Saharan African countries are represented by relevant studies in the included articles.
Included systematic reviews and primary studies will be presented together as a combined dataset, as ‘included articles’, unless otherwise specified. Most articles reported face-to-face (individual or group) interventions, while many interventions included face-to-face with a combination of telephonic and computer-based online interventions. Home visits, video-conferencing and a mobile app were less common. Most articles included participants with COPD or chronic lung disease (CLD) (n = 19), while just over half included participants with chronic heart disease (n = 12) and two articles included participants with chronic kidney disease on haemodialysis. No articles were included with interventions for patients with chronic liver disease. The duration of intervention varied, with the shortest being 6 days, the longest 48 months and an average duration of 10 weeks to 12 weeks. Interventions were delivered mainly by nurses and researchers, while some involved occupational therapists and physiotherapists, and some included a multi-professional team of health professionals. Some interventions included lay leaders in delivery. The number and length of sessions varied across studies, tailored to patient needs. The number, duration and setting of contact sessions varied widely. Table 3 identifies the countries and the settings in which the interventions were conducted, the intervention providers and study population recipients, the intervention duration, delivery modes, session number and session duration per participant.
Intervention components
The reported intervention components are classified according to the PRISMS taxonomy of self-management support.28 All 14 of the PRISMS taxonomy components were reported by the included systematic reviews, while nine were reported in the included LMIC primary studies; therefore, the intervention components are reported separately. Of the 21 systematic reviews obtained in search one, the most common direct intervention components included were lifestyle and advice and support (A14) (n = 17/21, 81%), information about condition and/or its management (A1) (n = 16/21, 76%), training and/or rehearsal to communicate with healthcare professionals (A11) (n = 12/21, 57%), training/rehearsal for practical self-management activities (A12) (n = 10/21, 47%) and practical support with adherence (A5) (n = 8/21, 48%). The least common direct intervention components were the provision of equipment (A7) (n = 2/21, 9%) and information about available resources (A2) (n = 3/21, 14%), with the rest of the components being used in the interventions at an average of 23% (n = 5/21). Figure 3 details the number of reviews that included each component of the PRISMS taxonomy.28
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FIGURE 3: Number of systematic reviews that include individual PRISMS taxonomy components from search one. The x-axis represents PRISMS self-management taxonomy components A1–A14. |
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Figure 4 details the number of primary studies including PRISMS taxonomy28 intervention components as part of search two. Of the 10 primary studies included, the most common direct intervention components were training or rehearsal for practical self-management activities (A11) (n = 8/10, 80%), education/information about the condition and/or its management (A1) (n = 8/10, 80%) and lifestyle advice and support (A14) (n = 6/10, 60%). Compared to the systematic reviews, the LMIC primary studies included a narrower range of intervention components.
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FIGURE 4: Number of primary studies that include individual PRISMS taxonomy components for search two. The x-axis represents PRISMS self-management taxonomy components A1–A14. |
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Table 4 reports information on the study setting, population and intervention components according to the PRISMS taxonomy. Online Appendix 2 reports details of the components of interventions for each included article.
| TABLE 4: Study setting, population and intervention components. |
Barriers
Eight studies9,32,33,42,43,46,52 reported barriers which were categorised29 into patient factors (seven barriers), health system factors (three barriers), health professional factors (two barriers) and an intervention factor (one barrier) (Table 5).
| TABLE 5: Barriers to symptom self-management. |
Facilitators
Five studies32,42,43,46,55 reported facilitators, which were categorised29 into patient factors (five facilitators) and intervention factors (four facilitators). Electronic messaging,32 information and education about the medical condition/symptoms46 and light exercise42 were identified as facilitators to effective self-management of the symptoms (Table 6).
| TABLE 6: Facilitators of symptom self-management. |
Contextual implementation factors were not routinely considered or described in the primary studies, but when discussed, they were related to the reported barriers and facilitators. In the CFIR outer setting domain, design for local culture and setting55 was described, with consideration of healthcare professionals’ availability and lack of access to pulmonary rehabilitation.59 Patient outcome follow-up was reported as challenging because of geographical and telephonic access limitations.56 One research team conducted an assessment of available local resources alongside the assessment of how to apply national policies to support implementation.51 Another article made a recommendation for policy change where the need for care was not met by the current policy.58 Chronic medication costs borne by patients and their lack of time off work to attend primary care facilities made low-cost exercise self-management interventions an important consideration in LMICs.50
The CFIR inner domain26,27 highlighted the centrality of relational connections for symptom self-management implementation. Family involvement appears very important,59 in particular to support understanding, psychological coping and practical application of symptom self-management.51 Regular telephonic or in-person engagement from researchers or healthcare providers supports adherence to self-management,55 with role clarity and relationship development supporting this process.57 The availability of telephonic or application-based text communication was described as important for advice and support of patients in their application of self-management.51,57 Emotional coping support and social activity consideration were recommended as necessary for a recipient-centred intervention.59 The benefit of cost, time and space utilisation for symptom self-management designed for the home was clearly beneficial for patients in the community.50,58
Discussion
This study details symptom self-management interventions for pain, shortness of breath and fatigue for patients with chronic lung, heart and kidney disease. The patient populations most commonly investigated in both searches were individuals with chronic lung diseases, specifically COPD, followed by chronic heart disease patients, where heart failure and coronary artery disease populations were most common. One systematic review41 and one primary LMIC study55 included interventions for individuals with chronic renal diseases with all undergoing haemodialysis at the time of intervention. These articles do not represent the large group of patients in LMICs who need but are not able to access dialysis for varying reasons.62,63
Because of the global increase in prevalence of chronic conditions, supporting self-management will increasingly become a core response of healthcare systems28 to improve patients’ quality of life.64 A tertiary systematic review of health service components for patients with advanced progressive chronic conditions showed that patient and family education and patient self-management are common components of effective services.65 Symptom self-management cannot be the responsibility of the person living with the chronic disease alone, but requires ongoing engagement between the patient, family caregivers, the healthcare professionals (HCPs) and the community-based care team.28,32,46,55,66 The PRISMS self-management taxonomy allows for the conceptualisation of self-management support and enables improved reporting of interventions and a clearer guide for the recommended components to optimise patient care.28 Interventions need not include all components, but consideration should be given to all the domains of self-management, and application should be contextualised and individualised as much as possible so as to tailor the intervention in a person-centred manner.28
The three most commonly included taxonomy components, A1 (information-giving), A11 (training/rehearsal for practical self-management activities) and A14 (lifestyle advice and support), are a low-resource way of supporting symptom self-management. The most common active PRISMS intervention taxonomy component28 identified was education (or information) about the condition and/or its management (A1). Education with the provision of information is a necessary starting point for any patient and family member to be able to increase their knowledge and understanding to start and then maintain self-management of their illness and their consequent symptoms.67 Information given, understood and retained by patients and family members is a part of the process of enabling self-determination68 and self-efficacy.7
Our findings show that information-giving and education can be approached in a variety of ways, all of which need consideration for relevance, acceptability and accessibility for the population and context concerned.67 This is supported by the findings of a systematic review of self-management interventions specifically conducted in primary care settings.64 Disease and management understanding also supports the patient’s understanding of their prognosis.68 A recent systematic review of interventions to improve patient prognostic understanding in advanced disease shows that such interventions that are specific for decision support, communication or a palliative approach appear to support appropriate prognostic understanding, but that this is a challenging outcome to achieve.69
Bayly et al.65 recommend that collaborative patient care that considers patients’ needs and not just diagnosis and management of acute events is supportive of effective care for patients with progressive disease. This should be considered in conjunction with a longer-term approach to supporting the implementation of symptom self-management that actively includes the patient and family and actively plans follow-up.65 Support for patients to learn and then develop skills in self-management can enhance self-efficacy.64 Repetition of information and assisting patients to understand how to embed self-management activities within day-to-day activities are necessary, and this underpins the importance of the need for supportive training and rehearsal of the taught self-management strategies.28,64 Healthcare professional roles in the process should include regular review9,45,49 and support for patient-directed goal setting31,33,37 with the collaborative action plans.9,28,33,48,52,58,64 The practical training and development of skills as part of symptom self-management requires active engagement from the healthcare provider.33,48,51,56,58
In terms of intervention implementation facilitators, there was no facilitator more common than another in either search. However, an underlying theme was that technology improved accessibility to the interventions and also adherence. Our findings show that patient adherence to self-management was noted as an important barrier. Understanding the challenges and reasons for limited adherence was less clear, although disease and management understanding are linked to adherence to medication,23,34 and self-care education has been shown to increase adherence to self-management.70 Patients need to feel motivated to engage and take responsibility for decision-making and their self-care.71 Motivational interviewing is a strategy in supporting self-efficacy towards effective symptom self-management,33,46 as are cognitive behavioural interventions.47 However, these formal approaches may be considered resource-intensive options, which may not be widely accessible in LMIC primary care settings. Further assessment is required of the access to resource-appropriate symptom self-management support for all those who require such support in primary care and community settings in LMICs. Electronic messaging, education on condition and light exercise were identified as facilitators to effective self-management of the symptoms. In the LMIC context, the latter two are practical and implementation may be set in motion through the healthcare workers, with additional training, development and support. Electronic messaging has been successfully applied,32,44,49 but resource constraints in LMICs mean that sustainability should be considered. Hearn et al.72 found that the use of phone calls and short message service (SMS) messages is effective for supporting self-management and does not require smartphones. However, the benefit of smartphones for playing video instructions was found to improve quality of life for patients with malignant disease in India,73 so smartphone use should not be discounted because of resource constraints.
Exercise is commonly applied as a symptom self-management intervention. While a range of exercises can be considered appropriate, single-limb exercises may not be sufficiently effective for shortness of breath or fatigue.36 Findings from our review suggest that exercise needs to be appropriate for cultural, contextual and resource considerations, as well as being individualised and person-centred, with ongoing support for implementation. The delivery of exercise interventions is acceptable when delivered by physiotherapists,74 but may be delivered by other professionals35,48,52,55,58 such as nurses.34,44
Relaxation and psychological strategies are recognised as important and necessary components of symptom self-management interventions, supporting patients and families to cope practically with psychological distress.9,33,37,40,47,48,54,59 Relaxation techniques are considered integral to the self-management of shortness of breath in chronic disease, and include use in crisis moments.75,76 Progressive muscle relaxation and deep breathing exercises appear to be effective in improving shortness of breath and fatigue in patients with COPD.54
The provision of information is an effective, low-resource and potentially time-efficient strategy, with the potential for patient benefit. Interventions requiring increased resources were less common, such as the provision of equipment (A7), access to support when needed (A8) and any intervention component with time-intensive rehearsal and training. In LMIC settings, the monitoring of the condition with feedback to the patient (A5) was not included at all. Monitoring the patient and providing feedback requires sufficient HCP time, which is a limited resource. Information about available resources (A2) and access to support when needed (A8) requires HCPs to have sufficient knowledge regarding local area resources and services. Gaining this knowledge requires understanding and time investments into ensuring provisions are adequate, as well as potential financial investments in resources to improve the standard of care. This is where the importance of collaborative approaches to self-management is highlighted. Multi-disciplinary healthcare teams and community care services together can facilitate appropriate coordinated care and enhanced self-management along the life course, particularly where formal rehabilitation services are scarce.2,5,77
Limitations and methodological considerations
The 21 systematic reviews included in this review allow for the representation of a comprehensive review of the published literature on the active components included within symptom self-management interventions for pain, shortness of breath and fatigue in the study populations. This provides a robust contribution to the planning and development of non-pharmacological interventions for individuals with chronic diseases experiencing breathlessness, pain and fatigue. There are a number of methodological limitations to this scoping review. Not all records were screened by two independent reviewers. Data synthesis and categorisation by the PRISMS taxonomy was necessarily conducted based on the reported intervention descriptions, which were not always sufficiently detailed for certainty around the classification and therefore relied on interpretation. No studies were identified among populations with chronic liver disease or with advanced renal disease not receiving dialysis.
Conclusion
Symptom self-management interventions play a significant role in reducing the prevalence and burden of physical symptoms in non-malignant conditions, improving patients’ feelings of self-efficacy and reducing dependence on health providers. This scoping review presents a practical descriptive overview of non-pharmacological symptom self-management for the common symptoms of pain, shortness of breath and fatigue as experienced by patients with non-malignant chronic respiratory, cardiac and renal disease. The categorisation of interventions according to the PRISMS taxonomy provides a classification of intervention options for researchers and clinicians. Accurate and understandable information is the basis for symptom self-management, but family involvement and support are also required to support rehearsal and application in the home. The synthesis of facilitators, barriers and LMIC setting implementation considerations highlights the importance of interventions being culturally and contextually relevant, as well as needing to be accessible for patients who experience functionally limiting symptoms in addition to geographical and financial access challenges. Interventions can be successfully applied by a diverse range of actors, including lay implementers such as health workers.
Acknowledgements
The authors wish to thank and acknowledge Joy Hunter and Francktesia Booysen for work towards search inclusion and extraction; and the University of Cape Town Bongani Mayosi Health Sciences Librarians for guidance on the conduct of the scoping review. Global Health and Palliative Care (GHAP) is funded by the National Institute for Health and Care Research (NIHR) under grant number GHRUG NIHR134440. Our group’s overall vision is to build capacity and evidence to improve access to effective palliative care for underserved populations in sub-Saharan Africa. Global Health and Palliative Care aims to: (1) integrate a child- and family-centred outcome measure into children’s palliative care at three Ugandan demonstration sites, develop data usage plans for quality improvement and deliver a manual for regional adoption; (2) develop a model of integrated cancer palliative care in Zimbabwe that is both appropriate and acceptable and determine the feasibility of a randomised controlled trial (RCT) evaluation design; (3) develop and assess the acceptability and feasibility of implementing a symptom self-management intervention for individuals living with chronic organ failure in South Africa, focusing on the high-prevalence symptoms of pain, breathlessness and fatigue.
Competing interests
L.F. reported that they have received funding from the South African Medical Research Council (SAMRC) through its Division of Research Capacity Development, specifically under the SAMRC Institutional Clinician Researcher Programme. The content presented here is solely the responsibility of the authors and does not necessarily reflect the official views of the SAMRC, which may have an interest in the research reported in this publication. The authors have fully disclosed their interests and have an approved plan in place to manage any potential conflicts arising from this involvement. R.H. holds the following unpaid leadership roles as defined by their titles: Trustee of Marie Curie, Co-chair of the African Palliative Care Association Research Network, member of the British HIV Association (BHIVA) Standards Steering Committee and Vice-Chair of the Worldwide Hospice Palliative Care Alliance (WHPCA). The author, R.K., serves as an editorial board member of this journal. R.K. has no other competing interests to declare.
Authors’ contributions
This study was conceived by R.H. and L.G. and further developed by R.H., L.G., K.v.P., R.K., N.N., H.B., M.M., C.E.-S., K.N. and L.F. The search was conducted by S.N., O.G. and L.F., while inclusion and exclusion decisions were made by S.N., L.F., N.N., H.B., K.v.P., M.M., C.E.-S., K.N., J.E.P., A.M. and O.G. Data extraction was performed by S.N., L.F., O.G., J.E.P. and A.M., with guidance from H.B., N.N., K.v.P. and M.M. Data analysis was carried out by L.F., H.B., O.G., N.N. and M.M. The article was initially drafted by L.F., with specific contributions from H.B., N.N., R.K. and O.G. Subsequent drafts were revised by L.F., and all authors reviewed the iterations.
Funding information
This work was supported by the NIHR (GHRUG NIHR134440), utilising UK aid from the UK Government to advance global health research. The views expressed in this publication are those of the authors and do not necessarily reflect those of the NIHR or the UK Government.
Data availability
Any additional data can be obtained upon reasonable request from the first author, L.F.
Disclaimer
The views and opinions expressed in this article are those of the authors and are the product of professional research. They do not necessarily reflect the official policy or position of any affiliated institution, funder, agency or the publisher. The authors are responsible for this article’s results, findings and content.
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