. Author manuscript; available in PMC: 2016 Apr 1.

Published in final edited form as: J Clin Epidemiol. 2014 Dec 29;68(4):412–417. doi: 10.1016/j.jclinepi.2014.10.008

Table 1.

Description of search methods and search strategies by information source

Database	Database Type	Search Method(s) Available	Search Type(s) Used
Google Scholar	Full text	Keyword	“control preference scale” or “control preferences scale” as phrase in title or abstract
		Cited references	1992 reference cited
		Cited references	1997 reference cited

PubMed	Bibliographic	Keyword	“control preference scale” or “control preferences scale” as phrase in title or abstract

Scopus	Bibliographic	Keyword	“control preference scale” or “control preferences scale” as phrase in title or abstract
Scopus	Bibliographic	Cited reference	1997 reference cited

Web of Science	Bibliographic	Keyword	“control preference scale” or “control preferences scale” as phrase in title or abstract
Web of Science	Bibliographic	Cited reference	1992 reference cited