- Research article
- Open Access
- Open Peer Review
Identifying and assessing the benefits of interventions for postnatal depression: a systematic review of economic evaluations
BMC Pregnancy and Childbirthvolume 18, Article number: 179 (2018)
Economic evaluations of interventions for postnatal depression (PND) are essential to ensure optimal healthcare decision-making. Due to the wide-ranging effects of PND on the mother, baby and whole family, there is a need to include outcomes for all those affected and to include health and non-health outcomes for accurate estimates of cost-effectiveness. This study aimed to identify interventions to prevent or treat PND for which an economic evaluation had been conducted and to evaluate the health and non-health outcomes included.
A systematic review was conducted applying a comprehensive search strategy across eight electronic databases and other sources. Full or partial economic evaluations of interventions involving preventive strategies (including screening), and any treatments for women with or at-risk of PND, conducted in OECD countries were included. We excluded epidemiological studies and those focussing on costs only. The included studies underwent a quality appraisal to inform the analysis.
Seventeen economic evaluations met the inclusion criteria, the majority focused on psychological /psychosocial interventions. The interventions ranged from additional support from health professionals, peer support, to combined screening and treatment strategies. Maternal health outcomes were measured in all studies; however child health outcomes were included in only four of them. Across studies, the maternal health outcomes included were quality-adjusted-life-years gained, improvement in depressive symptoms, PND cases detected or recovered, whereas the child health outcomes included were cognitive functioning, depression, sleep and temperament. Non-health outcomes such as couples’ relationships and parent-infant interaction were rarely included. Other methodological issues such as limitations in the time horizon and perspective(s) adopted were identified, that were likely to result in imprecise estimates of benefits.
The exclusion of relevant health and non-health outcomes may mean that only a partial assessment of cost-effectiveness is undertaken, leading to sub-optimal resource allocation decisions. Future research should seek ways to expand the evaluative space of economic evaluations and explore approaches to integrate health and non-health outcomes for all individuals affected by this condition. There is a need to ensure that the time horizon adopted in studies is appropriate to allow true estimation of the long-term benefits and costs of PND interventions.
Postnatal depression (PND), also called postpartum depression, is a non-psychotic, depressive disorder occurring in women within a year after childbirth [1, 2]. It is a common disorder thought to affect 1 in 10 women within the first postpartum year . The period prevalence of minor or major depressive episodes is estimated to be 19.2% in the first three months following childbirth, with 7.1% of mothers experiencing major depressive episodes . Mothers with PND are likely to experience disturbing emotions and feelings common to depression such as anger, guilt, hopelessness, social withdrawal, and those specific to the perinatal period such as sleep deprivation and bonding difficulty [4, 5].
As well as affecting the mother, PND can also affect others within the family. A meta-analysis of studies documenting depression of fathers in the first postpartum year reported that fathers had a 10% risk of experiencing depression and found the correlation between paternal and maternal depression to be positive and moderate . The experience of PND in the parent or parents can potentially lead to marital problems, the withdrawal of social support between parents can compromise adequate care-giving practices of parents, or parent-baby interactions (e.g. the ability of the mother to respond sensitively to her child), that in turn may negatively affect the cognitive, behavioural and social development of the infant in the short and long-term [7,8,9].
The economic costs associated with PND are significant . In 2002, Petrou and colleagues reported average additional health and social care costs of £392 (2000 prices; UK pound sterling) in women with PND compared to women without PND over the first 18 months post-partum . Recently, Bauer and colleagues estimated that the societal discounted cost of depression during pregnancy and the postnatal period in the long-term was nearly £74,000 per case (2012/13 prices; UK pound sterling) . Around 70% of the projected costs related to the impacts on children, calculated in terms of pre-term birth, mortality, emotional problems, education and conduct, over a period ranging between birth and overall lifetime.
PND has long been considered a major public health problem [13, 14] and a range of PND interventions have been developed in order to prevent or treat the condition. Compared to evaluations of clinical effectiveness of PND interventions, evaluation of their cost-effectiveness within an economic evaluation (comparative analysis of alternative interventions or programmes in terms of both costs and consequences) has been relatively limited [15,16,17]. The economic evaluation of a PND intervention is essential to understand the value of the intervention relative to other interventions to allow appropriate allocation of healthcare resources . A key consideration in an economic evaluation of an intervention in health conditions like PND, where the impact could potentially go beyond mothers to children, fathers, and could include non-health aspects such as the child’s educational and emotional well-being, is ensuring that all relevant outcomes for all those affected by the intervention are identified and included . Furthermore, it may be necessary to include outcomes that are broader than typical direct health outcomes, as is often the case for public health interventions [20, 21].
Therefore this study was conducted with the aim to systematically review published and unpublished studies of interventions to treat or prevent PND, in which an economic evaluation has been conducted in OECD (Organisation for Economic Cooperation and Development) countries, in order to investigate the outcomes considered and measured. The specific objectives were i) to identify studies of interventions to prevent or treat PND which included an economic evaluation; ii) to ascertain which outcomes were included and how these were measured and valued; and iii) to identify any methodological issues associated with including and measuring outcomes in economic evaluations of PND interventions.
A systematic review was conducted in adherence with guidance on methods from the Centre for Review and Dissemination  and on reporting from Preferred Reporting of Items for Systematic Review and Meta-Analysis (PRISMA) .
A comprehensive, systematic search strategy was developed through consultation with an information specialist (Additional file 1). The searches were run from database inception to July 2015 in eight healthcare databases: MEDLINE, MEDLINE in-process and other non-indexed citations, EMBASE, PsychINFO, Cumulative Index to Nursing & Allied Health Literature (CINAHL), National Health Service Economic evaluation database (NHS EED), Health Technology Assessment (HTA) and Web of Science (WOS) core collections. The search was not restricted by the publication date or language. Alongside this process, key journals were hand-searched (these were those which appeared most frequently in results of the searches for relevant papers) and reference lists of all the included studies were screened. Furthermore, key researches in the field and members of the Birmingham Perinatal and Infant Mental Health Forum were contacted to identify potential published or unpublished literature.
Inclusion and exclusion criteria
The studies were assessed and selected using the PICOS framework  as a guide. The inclusion criteria were: women with or ‘at risk’ of postnatal depression (i.e. those who are pregnant or have given birth within the 12 months), living in OECD countries, and interventions involving preventive strategies (including screening), and any treatments or other interventions for PND. We restricted our focus to OECD countries, in order to compare economic evaluations concerned with similar health care systems. The comparators included placebo, no intervention and current or standard care. In terms of study design, studies that involved a full or partial economic evaluation or that included economic data were potentially eligible for inclusion.
Broadly speaking, the different forms of economic evaluation can be differentiated by how outcomes are considered (although there are also other key differences, for example, in terms of their theoretical foundations) . A cost-utility analysis (CUA) involves consideration of outcomes in terms of quality-adjusted-life-years (QALYs) which combine measurement of quantity and quality of life . In cost-effectiveness analysis (CEA) outcomes are expressed in natural units (e.g. cases detected) and in cost-benefit analysis (CBA) outcomes are valued in monetary terms. Partial forms of economic evaluation include cost-consequence analysis (CCA) where costs and outcomes are presented in a disaggregated form and cost-minimisation analysis (CMA) that is only recommended in certain circumstances where treatments are proven to have identical outcomes .
The following were excluded from the review: epidemiological studies reporting incidence/prevalence; costing studies describing costs only; clinical studies describing and evaluating efficacy or effectiveness only; ongoing or incomplete economic evaluations; discussion papers, letters or commentaries.
A two-stage process outlined by Roberts and colleagues  was used to select and categorise studies based on their eligibility and codes for Stage 1 and 2 are provided in Additional file 2 (and as a Footnote for Fig. 1). Stage 1 involved the initial categorisation of studies into categories A to E based on titles and abstracts according to whether the study involved an economic evaluation or included economic data. One author (BG) carried out the initial coding of the studies and another author (LJ) checked the coding. Studies categorised as potentially relevant to the systematic review were carried forward to Stage 2 and assessed for inclusion based on their full-text. One author (BG) carried out the stage 2 coding from 1 to 7, which was then checked by two authors (LJ and MM) and two authors (BG, LJ) assessed the full-texts of all the studies carried forward to Stage 2.
Data extraction and quality assessment
A data extraction form was used to collect data on the background of the study, details of the outcomes included and any methodological limitations acknowledged by study authors (Additional file 3). The included studies were assessed for quality using an adapted version of Drummond et al.’s checklist , which is judged to be suitable for assessing economic evaluations . According to the objectives of the review, the modifications to the checklist included greater focus on outcomes than costs, the addition of a question on the perspective of analysis and the removal of a general question on the study results. The assessment aimed to inform the main analysis rather than to exclude studies based on quality (the full results are available in Additional file 4).
The electronic search of the databases yielded 2360 studies. A further eight studies were identified as potentially relevant to the review from other sources (key researchers in this field and the forum members). After removing 537 duplicates, 1831 records were categorised based on title and abstract (Stage 1). The full-texts of 58 papers were assessed (Stage 2) and 17 studies were identified for synthesis. Figure 1 presents a PRISMA flow diagram of the articles screened, included or excluded in each stage.
The study characteristics are provided in Table 1. The studies were predominantly from the UK (n = 13) with a further four studies conducted in Australia , Canada , New Zealand  and the USA .
A variety of interventions were evaluated in the identified studies that conducted an economic evaluation. Nine studies examined interventions concerned with preventive strategies only [26, 27, 29,30,31,32,33,34,35], five studies included both screening and treatment [28, 30, 36,37,38], and the remaining three studies assessed treatment only [39,40,41]. The most common type of intervention was modified or enhanced support or care in the perinatal period either from a health professional or via peer support [27, 28, 30,31,32,33,34,35, 41]. Many of the interventions included cognitive behavioural therapy (CBT), either alone , or in combination with other therapies such as antidepressants , interpersonal therapy , listening visits [37, 38] and a range of customised treatments . A pharmacological intervention was delivered as one of the interventions in three studies only [35, 39, 42]. Various screening tools (Edinburgh Postnatal Depression Scale - EPDS, Whooley questions, Beck Depression Inventory, PHQ-9) were assessed as part of a wider strategy to identify and treat those experiencing PND [28, 36, 38].The comparator adopted was usual, standard or current care/practice/services in nearly all studies. Two studies used ‘no intervention’ as the comparator [30, 34]. Seven studies did not provide a comprehensive description of their comparators [26, 31, 32, 35, 40,41,42].
All studies investigating screening considered women in their postnatal period [28, 36,37,38, 42]. Other preventive strategies focused on pregnant [31, 33] and/or postpartum women [26,27,28, 30, 33, 35]. For treatment interventions, the targeted population were postpartum women with a PND diagnosis and/or women scoring above the threshold of a screening tool [28, 36, 38,39,40,41,42].
There were some differences in terms of the aims of the interventions evaluated. All but three studies evaluated an intervention that focussed on preventing and/or treating PND alone. These three studies focused on improving other aspects of health and well-being in addition to addressing PND, including women’s physical and general health [31, 32], maternal smoking  and child injury .
There was a greater number of studies that conducted an economic evaluation alongside a Randomised Controlled Trial (RCT) [26, 27, 31,32,33, 35, 37, 41] or a cohort study [29, 39] compared to studies that undertook decision modelling [28, 30, 34, 36, 38, 40, 42]. Different approaches to analysis were adopted. CUA was the main approach adopted by six of the 17 studies [28, 36,37,38, 40, 42]. Of these six studies, two further conducted a CEA [28, 38]. Five of the 17 studies adopted a CCA [26, 29, 31, 35, 41] and three studies conducted a CEA only [27, 33, 39]. Two studies carried out a CBA [30, 34] and only one study conducted a CMA .
Health and non-health outcomes
Different types of both health and non-health outcomes were included in the economic evaluations (Tables 2 and 3). All economic evaluations included maternal health outcomes. Thirteen studies included condition-specific outcomes including PND duration ; cases recovered or improved [28, 38, 39], cases detected or averted [27, 28]; improvement in PND symptoms [26, 29, 34, 41] or scores from a screening tool [31, 32, 35]. Five studies also used generic outcomes such as well-being [26, 30, 34] and general health [35, 41]. Six studies measured health in terms of QALYs from the maternal perspective [28, 36,37,38, 40, 42]. However, health outcomes relating to children were considered in only four studies, this was in terms of cognitive functioning , sleep , temperament [26, 41], and depression . Seven studies acknowledged that outcomes for children and/or partner health were important or likely to be affected but did not include them in their analysis [28, 36,37,38,39,40, 42]. Only three of the seven studies explained their omission; this was typically due to a lack of reliable data [28, 36], or due to missing data . There was no mention of child or partner/family health outcomes in four studies [27, 29, 32, 33].
Similarly, non-health outcomes were explicitly considered by four studies only in relation to PND [29, 30, 34, 41]. Nearly all of these studies included outcomes relating to social or emotional support for PND [29, 30, 41]. Other non-health outcomes included mother’s employment and earnings, parent-infant interaction, children’s educational attainment and behavioural problems, couples’ relationships, satisfaction and efficacy in parenting role, and family functioning. Another four studies explicitly acknowledged the significance of non-health effects, but did not include them [26, 28, 38, 39]. A lack of relevant evidence was the main reason stated for excluding potential non-health effects [30, 34, 38].
Outcome measurement and valuation
Different instruments were used to assess the presence, risk or duration of PND as an outcome in the economic evaluation (Tables 2 and 3). Seven studies employed the Edinburgh Postnatal Depression Scale (EPDS) [26, 27, 31, 32, 35, 38, 41]. However, although the same tool was used, a range of thresholds were used. For example, the thresholds used to define the risk of PND ranged from 9 above  to 13 or above . Some defined the EPDS threshold in relation to its level of specificity and sensitivity, by validating it against an existing diagnostic tool  or by piloting it on trial participants , while others referred to different published sources [26, 27]. Other instruments were also used, with three studies employing the Patient Health Questionnaire [28, 29, 38], two using the Structured Clinical Interview for Depression [27, 33] and one study adopting the Clinical Interview Schedule .
In all the economic models that used QALYs, the utility weights were derived from secondary sources (Table 3). Three studies used the same source for utility values [28, 36, 42]. In most cases, the utility values used were based on the health states associated with depressed or general populations rather than women with PND. For other studies involving a monetary valuation of outcomes, some of the valuations of outcomes were based on authors’ own estimates, due to a lack of available data .
Other methodological considerations
The most common perspective adopted by the economic evaluations was a National Health Service/Personal Social Services (NHS/PSS) or a healthcare perspective only (n = 10) [26, 28, 31,32,33, 36,37,38, 40, 41]. Three studies adopted a societal perspective only [34, 39, 42]. Two studies took a societal perspective alongside other perspectives such as a public sector perspective , a third-party payer perspective, a healthcare perspective and family perspective . In one study , a patient perspective was taken alongside a healthcare perspective.
Time horizon and discounting
There were some variations in terms of the time horizon adopted for costs and consequences by the economic evaluations (Table 4). The most common time horizon for outcomes was a year (n = 9), followed by six months (n = 3), 18 months (n = 2), and 12 weeks (n = 2). Only two studies adopted time horizons longer than a year, justifying them as necessary due to the short and longer-term impacts of PND [29, 33]. Justifications for adopting a limited time horizon included constraints associated with the trial follow-up period [27, 33], practical limitations and budget constraints . As most studies had the time horizon of a year or less, discounting of benefits was not required. The two studies adopting a longer time period discounted the benefits appropriately at the recommended rate [30, 34].
Some studies used intermediate outcomes such as cases detected or averted [27, 28]. While such outcomes may be meaningful in the context of PND interventions, they can be of more limited general use for commissioners as they do not allow comparison of cost-effectiveness across programme areas .
Almost half of the studies did not explore uncertainty around the estimates of outcomes within a sensitivity analysis. Those studies that performed sensitivity analysis mainly conducted a deterministic sensitivity analysis [28, 30, 32, 39, 40, 42] and a few studies conducted probabilistic sensitivity analysis [27, 38, 40].
Cost-effectiveness of interventions
Of the 11 studies conducting full economic evaluations, 10 reported that the intervention under investigation appeared to be cost-effective (Table 4). Of those 10 studies, three studies found that a combination of PND screening and treatment was cost-effective [28, 37, 42], a further three studies reported that treatments such as psychological therapy, facilitated self-help and customized treatment were more cost-effective than standard care [36, 38, 39], and four studies found positive results for preventive strategies which involved peer support or counselling and other specific support [27, 30, 33, 34]. Group CBT was not found to be cost-effective compared to standard care in one study .
The systematic review identified 17 studies of interventions to prevent and/or treat PND, in which an economic evaluation was conducted. The majority of the studies focused on psychological or psychosocial interventions and none focused on pharmacological interventions only. Overall, 10 of the 11 full economic evaluations reported that an intervention was cost-effective. These involved a variety of interventions ranging from additional support from health professionals, peer support and combined screening and treatment strategies which were usually compared with standard care. The review identified a number of methodological issues relating to how outcomes were included, measured and valued in the economic evaluations; these related to whose outcomes were included, the inclusion of relevant health and non-health outcomes, study perspective and time horizon.
Guidelines emphasise the need to identify all relevant outcomes in an economic evaluation [25, 43]. However, only four studies considered health outcomes associated with children [26, 30, 34, 41]. This raises concerns since numerous studies have shown the adverse impacts of PND on the child’s health and development, and on their interaction with their mothers [20, 44]. The exclusion of children’s outcomes from an economic evaluation may mean that an incomplete assessment of cost-effectiveness has been undertaken. For example, an intervention found to be less cost-effective compared to another intervention on the basis of maternal outcomes only, may well be more cost-effective when potential benefits to the infant’s health are included. However, there could be potential barriers to considering infants’ outcomes such as lack of robust data, or an inability to measure outcomes directly for children. A further methodological barrier could be related to concerns about increasing the likelihood of findings of false significance (type I error) due to the inclusion of multiple outcomes in an evaluation. Similarly, health outcomes for the father and wider family are potentially relevant and require consideration [19, 21].
Non-health outcomes are relevant and important in the context of PND . However, presently, there is no accepted method to determine which non-health effects are important and how they should be incorporated in an economic analysis . A range of potential approaches for public health interventions have been outlined that allow for the inclusion of health and non-health outcomes (e.g. cost-consequence analysis, cost-benefit analysis etc.) . The focus of most of the studies was exclusively on health, with only four studies measuring some kind of non-health outcomes. Several authors deemed non-health outcomes to be important but did not include them in their evaluation due to challenges such as a lack of reliable and quantifiable data, missing data, and more than one primary outcome being included in the trial.
Some methodological issues were evident relating to the measurement and valuation of outcomes. A detailed analysis of the properties and limitations of the existing instruments used to capture outcomes is essential to inform appropriate ways to measure those outcomes. For example, the frequently used EPDS tool had various cut-off thresholds, indicating differing approaches to using this tool. Many authors of the included studies also mentioned the lack of reliable data on utilities. For example, Stevenson et al.  used regression techniques to estimate utilities (based on data from a different trial) but acknowledged that this introduced further uncertainty in the analysis. Other authors used utility weights based on the health states associated with general depression and not PND. Although PND and general depression share some similar symptoms they differ in certain characteristics such as the experience of childbirth and sleep deprivation . If utility estimates do not directly relate to PND, there is a possibility that the utilities may overestimate or underestimate the intervention effects.
A societal perspective is generally considered the most appropriate perspective for PND interventions due to the wide range of impacts associated with the condition [21, 45, 46]. This is in keeping with guidance relating to the economic evaluation of public health interventions, where a perspective broader than the healthcare perspective may be necessary . This would enable outcomes beyond health to be considered, such as those relating to education, housing, crime etc. However, the results of this review demonstrated that only five studies adopted a societal perspective.
Another recurrent issue observed was the limited time length adopted by most of the studies. The time horizon was no more than 18 months in the trial-based economic evaluations. It can be argued that important differences between the interventions may not be captured using short time-horizons. For example, a prospective longitudinal study showed that the children, who were adversely affected in their infancy due to their mother’s PND at 3 months postpartum, experienced more problems with intellectual and academic performance at 11 years of age compared to the children of healthy mothers  and those problems could have potential economic consequences such as additional school support costs and productivity losses from leaving school without qualifications . Thus, studies adopting a longer time horizon are needed to be able to capture the long-term effects of PND.
This review has several strengths. Systematic and rigorous processes were adopted to identify and assess studies. A comprehensive search strategy was implemented which also included searches for unpublished reports. Both prevention and treatment strategies were included, providing a holistic overview of several methodological issues concerning outcome identification and measurement for the economic evaluation of PND interventions. Using established criteria  a quality appraisal process was undertaken analysing all key elements relating to outcomes.
Nonetheless, the review is subject to some limitations. Firstly, potential studies may have been missed by the search strategy either due to inadequate classifications of economic terms in the databases or due to the different ways interventions to improve mental health in the postpartum period can be coded depending on the type or the focus of intervention (e.g. on the mother, the infant etc.) . Secondly, since we could not find detailed guidelines focussed on economic evaluations of PND interventions, our analysis of the quality of the studies was based on generic guidance. Lastly, an in-depth analysis of evidence on the clinical and cost-effectiveness of the interventions was beyond the review’s scope.
This is the first systematic review to examine the approaches taken and types of outcomes used in economic evaluations of PND interventions (for prevention and treatment). A systematic review undertaken by the National Collaborating Centre for Mental Health  was concerned with accumulating evidence on the cost-effectiveness of interventions to prevent or treat mental health problems in pregnancy and the postnatal period. More recently a systematic review  was conducted to inform parameters for a model-based economic evaluation of antenatal and postnatal interventions for pregnant and postnatal women to prevent PND. While these studies attempted to identify economic evaluations of PND interventions, they did not explore the methodological issues associated with the approaches taken and outcomes adopted in the studies.
The findings of this review highlight several implications for future research. Future economic evaluations should identify and consider the full range of potential outcomes that are relevant in the context of PND: health and non-health outcomes, maternal, family and child outcomes. The development of new methods and refinement of existing approaches that can incorporate both health and non-health benefits of intervention are essential for a complete evaluation of the cost-effectiveness of PND interventions. The list of outcomes generated from this review, as a preliminary framework, could be refined further through engagement with key stakeholders including mothers, family members, clinicians and healthcare commissioners to reach consensus on what outcomes are important for use in economic evaluations of PND interventions and in wider evaluations of interventions and services. Given the wide range of impacts associated with PND, in order to allow a full assessment of costs and consequences, a societal perspective should be considered. However, key challenges remain around the monetary valuation of outcomes to enable analyses adopting a societal perspective to be carried out more robustly. Research addressing this issue could explore methods that have been used before in relation to general depression [48, 49]. Similarly, if QALYs are used as outcome, there is an urgent need to address the paucity of estimates of health state utility values relevant to PND. The limited time period inherent in trial-based economic evaluations could be overcome by exploiting modelling techniques that extrapolate outcomes and costs over an extended timeframe  and the most appropriate time horizons could be further explored in consultation with decision-makers. In all types of economic evaluation, robust sensitivity analyses will need to be undertaken to explore the implications associated with uncertainty around outcome estimates.
This systematic review has demonstrated that very few economic evaluations included and identified all outcomes relevant to PND interventions. For example, outcomes for the child were not included in most studies, and only a minority included non-health outcomes. Thus, the review paves the way for further work to explore new approaches and methods that enable inclusion of relevant health and non-health outcomes. In addition, the time horizons adopted in the studies did not allow long-term outcomes for the child to be addressed, which have been shown to be important for PND. The review also shows that a broader perspective can facilitate the assessment of the overall impact of interventions in this area. To achieve optimal policy decisions for interventions to prevent and treat PND, addressing these methodological issues is essential.
Cumulative Index to Nursing & Allied Health Literature
Edinburgh postnatal depression scale
Health Technology Assessment
- NHS EED:
National Health Service Economic evaluation database
National Health Service
National Institute of Health and Care Excellence
Organisation for Economic Co-operation and Development
Randomised controlled trial
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This systematic review was undertaken at the Health Economics Unit at the University of Birmingham as part of Binu Gurung’s MSc dissertation. We are grateful to Jane Barlow (University of Warwick), Annette Bauer (The London School of Economics), Sukhdev Sembi (University of Warwick) and the members of ‘Birmingham Perinatal Maternal and Infant Mental Health Forum’ for providing us access to relevant unpublished studies and data. We also thank Susan Bayliss (University of Birmingham) for her support in refining the search strategy.
Availability of data and materials
The data on which the conclusions of the manuscript rely are presented in the main paper and Additional files.
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(The manuscript does not report on or involve the use of any animal or human data or tissue, as it is a systematic review)
The authors declare that they have no competing interests.
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A search strategy carried out in Ovid MEDLINE (from 1946 to July Week 1 2015). (DOCX 18 kb)
Categorisation Criteria (details of the two-stage process used for study screening and selection). (DOCX 16 kb)
Description of key methodological issues relating to outcomes (limitations as acknowledged by the authors of the included studies). (DOCX 20 kb)
Results of study assessment using Drummond’s checklist (adapted). (DOCX 21 kb)