Sitios más solicitados, tanto por médicos como por los pacientes.

Health World Online www.healthy.net	Internet Grateful Med www.nim.njh.gov
Physicians Home Page www.php2.silverplatter.com	Medconnet (Emergency Medicine) www.medconnet.com
American Physical Therapy Association  www.apta.org	Terapia Respiratoria www.xmission.com
American Society for Microbiology www.asmusa.org	Micorbial Underground www.qmw.ac.uk/-rhbm001/index.html
Radiation Oncology www.oncolink.upenn.edu	Diagnostic Test Information Server www.ucsf.edu/testsearch.html
Pharmaceutical Information www.pharminfo.com	HIVNALIVE www.hivnalive.org
HIVNET www.hivnet.org	American College of Rheumatology  www.acr.org
American Cancer Society www.cancer.org	National Cancer Institute www.nci.nih.gov
American Diabetes Association www.diabetes.org	Diabetes Monitor www.mdcc.com
NIDDK www.niddk.nih.gov	The Emergency Medicine and Primare Care  www.njnet.com
Journal of Family Practice Online www.phymac.med.wayne.edu	Hypertension, Dialysis and Clinical Nephrology  www.medtext.com
MGH Neurology http://neuro-www.mgh.harvard.edu	NeuroSourse www.neurosourse.com
Base de datos LILACS www.bireme.br