PubMed and PubMed Central
Scopus
Chemical Abstract Services (CAS)
Directory of Open Access Journals (DOAJ)
Islamic World Science Citation (ISC)
WHO/EMR/Index Medicus
CINAHL
Scientific Information Database (SID)
EMCare
Scirus (Elsevier)
Iran Medex
Microsoft's Live Academic
New Jour
Index Copernicus
Magiran