Table 1.

Databases and search results (N=4669).

Database	Provider or vendor	Search results, n (%)
MEDLINE	OvidSP	366 (7.83)
Embase	OvidSP	480 (10.28)
CINAHL	EBSCO	225 (4.82)
Web of Science	Clarivate	327 (7)
Scopus	Elsevier	485 (10.39)
Cochrane Library	Wiley	264 (5.65)
Gray literature	Not applicable	2452 (52.52)
Google Scholar and Google internet search	Web sites	70 (1.5)