URL Address	Company Name	Name of Electronic Resource
:www.webofknowledge.com	Thomson Reuters
www.ncbi.nlm.nih.gov/pubmed	pubmed
www.onlinelibrary.wiley.com	Wiley
www.scopus.com	Elsevier
www.elsevier.com/solutions/embase-biomedical-research	Elsevier
www.sciencedirect.com	Elsevier
www.clinicalkey.com	Elsevier
www.uptodate.com	Wolter Kluwer
www.journals.research.ac.ir	Wolter Kluwer