Table 1.

Results of literature search.

Database	Hits	Hits after deduplication
Embase.com	945	940
Medline (OvidSP)	364	97
Web-of-science	323	123
PubMed publisher	8	4
Cochrane DARE	7	2
Google scholar	100	79
Total initial search	1756	1245
Total set after applying restrictions		87
Additional vector search results		18
Final set used for detailed analysis		38