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. 2015 Oct 8;4:481. Originally published 2015 Aug 5. [Version 2] doi: 10.12688/f1000research.6804.2

Table 1. Coverage of various bibliographic databases.

Scopus temporal coverage was retrieved here http://www.elsevier.com/__data/assets/pdf_file/0007/69451/sc_content-coverage-guide_july-2014.pdf.

Database	Indexed Citations	Temporal Coverage
PubMed	over 24 million	1946-present
Web of Science	over 90 million	1900-present
Scopus	over 57 million	1823-present
Google Scholar	100 million–160 million ^2, 3	1700-present ³