DW developed review content, wrote protocol, developed search strategy, completed all searching, screened all citations, scrutinised all abstracts to identify potential papers, obtained hard copies of potential papers, applied inclusion/exclusion criteria to identified papers and wrote final review manuscript. DW reviewed articles for inclusion in the updated review and contributed to the revised and updated manuscript.

MS developed review content, contributed to writing protocol, contributed to developing search strategy, scrutinised all abstracts to identify potential papers, applied inclusion/exclusion criteria to identified papers and contributed to the writing of the final review manuscript.

TD contributed to writing protocol, commented on search strategy, applied inclusion/exclusion criteria to identified papers and contributed to the writing of the final review manuscript. Provided methodological advice throughout process.

Nicola Brooks contributed to writing protocol, commented on search strategy, contributed to the scrutiny of abstracts to identify potential papers, applied inclusion/exclusion criteria to identified papers and contributed to the writing of the final review manuscript.

AD and DG independently scrutinised all titles, abstracts, and full articles for inclusion in the updated review, and amended the updated review manuscript.