This systematic review will involve searches of MEDLINE, EMBASE, CINAHL and Cochrane databases. Further studies will be obtained from scanning reference lists of relevant studies, including other systematic reviews, and citation searching of key papers identified for inclusion. Any study published from the inception of the databases, prior to January 2020 will be included in the review. The search will be updated prior to submission of the review. A search strategy was developed with the initial support of a medical research librarian (online supplementary file 3).
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