Bibliographic database

Biosis

CINAHL

ClinicalTrials.gov

CNKI

Cochrane Central Register of the Controlled Trials (CENTRAL) http://www.cochrane.org

Cochrane Library

Cumulative Index to Nursing and Allied Health Literature

Dissertation abstracts

EMBASE

EBSCO

Gale databases

Global Index Medicus

Google Scholar

Grey literature

IndexCat

LILACS

MEDLINE

National Technical Information Service

Ovid

Pubmed

ProQuest

Science Citation Index

Scopus

Turning Research into Practice (TRIP)

UpToDate

Thomson Reuters Web of Science database.

China National Knowledge Infrastructure

http://cbmwww.imicams.ac.cn/

Chinese Medical Current Content (cmcc)

http://www.cmcc.org.cn

China National Knowledge Infrastructure (chkd-cnki)

http://www.cnki.net

vip information/ Chinese Scientific Journals database (csjd-vip)

http://www.cqvip.com

wanfang database (Chinese Medicine Premier)

http://www.wanfangdata.com