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. 2022 Sep 14;12(9):e060912. doi: 10.1136/bmjopen-2022-060912

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Study flow diagram. RCT, randomised controlled trial. *The number of records identified from each database and register searched were: pubmed (16), embase (38), medline (289), scopus (508), sinomed (21), web of science (633), cochrane (136), clinical trial (18).