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. The search strategy will utilise a combination of keywords and MeSH terms. Literature databases such as PubMed, Embase, The Cochrane Library, CINAHL and WHO Global Health Library will be searched. Two reviewers will independently screen retrieved citations to determine if they meet inclusion criteria. Studies will be
databases were searched for published and unpublished literature using keywords, supplemented by hand searches. Data were extracted for characteristics of the intervention and the study, study findings and the methodological quality was assessed.The majority of the eleven eligible studies were randomized controlled trials
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