URL Address

Access

Company Name

https://www.clinicalkey.com/

No

Elsevier

http://gateway.ovid.com/autologin.html

No

Wolter Kluwer

http://search.proquest.com/index

Yes

ProQuest

http://www.sciencedirect.com/

No

Elsevier

http://link.springer.com/

Yes

Springer