Table 1.

Databases and document types included in the search.

Database	Document Type Included
Web of Science	Abstract, Article, Case report, Correction, Early Access, Retraction, Review
Scopus	Article, Review, Short survey, Erratum
PubMed	Case Reports, Classical Article, Clinical Study, Clinical Trial Protocol, Clinical Trial, Phase I, II, III, IV, Controlled Clinical Trial, Corrected and Republished article, Journal Article, Letter, Multicenter Study, Preprint, Published Erratum Research support, Research Support, NIH, Extramural Research Support, NIH, Intramural Research Support, Non-US Gov’t Research Support, US Gov’t, Non-PHS Research Support, US Gov’t, PHS Research Support, US Gov’t Retracted Publication Retraction of Publication, Technical Report, Twin study, Validation Study