1.

Directory of Clinical Databases

http://www.docdat.org/

2.

National Electronic Library for Health

www.nelh.nhs.uk

3.

Public Health Electronic Library

www.phel.gov.uk

4.

Galter Health Smartlibrary

http://www.galter.northwestern.edu

5.

Biohealthmatics.com

http://www.biohealthmatics.com

6.

Pub Med

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi

7.

Cochrane

http://www.cochrane.org