http://www.webmd.com
2. Medscape
http://www.medscape.com
3. PDR.net
http://www.pdr.net
4. MedUnite
http://www.medunite.com
5. Medem
http://www.medem.com
6. medsite
http://www.medsite.com
7. ePhysician
http://www.ephysician.com
8. HealthGate
http://www.healthgate.com
9. Med Connect
http://www.medconnect.com
10. American Medical Association
http://www.ama-assn.org