Searches
We searched databases such as
MEDLINE, Embase, and CINAHL and study registries including
ClinicalTrials.gov and ICTRP from launch until 29 October 2020.
Qualified authors (YT and YK) developed the search strategy
(Supplementary Table S2). No language or publication status restrictions
were imposed. Reference lists of shortlisted studies were searched
manually for additional potentially eligible titles.