Cochrane
(http://www.update-software.com/Clibplus)

Medline
(http://www.ncbi.nlm.nih.gov/sites/entrez)

Medline Plus
(http://medlineplus.gov)

Pubmed
(http://www.pubmed.nl)

Flasog
(http://www.flasog.org)

Royal college
(http://www.rcog.org.uk)

American college
(http://www.acog.org)