Study identification
MEDLINE, Embase, and the CENTRAL Trials Registry of the Cochrane
Collaboration were searched using the Ovid interface. Searches were
limited to English, French, German, Polish, and Spanish languages and to
the publication year January 2000 up to July 2021. Searches were
designed and conducted by a librarian experienced in systematic reviews,
using a method designed to optimize term selection
(KoH).6 Electronic search strategies are presented in
Supplemental Appendix A.