American College of Gastroenterology	...	http://www.acg.gi.org/
American Cancer Society	...	http://www.cancer.org/docroot/home/index.asp
Asociación Médica de Puerto Rico	...	http://www.asociacionmedicapr.com/
Clinical Pharmacology & Therapeutics		http://www2.us.elsevierhealth.com/scripts/om.dll/serve?action=searchDB&searchdbfor=home&id=cp
Electronic Medicine Journals		http://www.library.tmc.edu/open/ejournals.html
Guía El Médico.Net	...	http://www.elmedico.net/
Indice Mexicano de Revistas Biomédicas		http://www.imbiomed.com.mx/InicioE.html
Journal of Analytical Toxicology		http://www.jatox.com/
National Library of Medicine...		http://www.nlm.nih.gov/nlmhome.html
Manual Merck - 17ed.	...	http://www.merck.com/mrkshared/mmanual/home.jsp
Med Help International	...	http://www.medhelp.org/
MedicalStudent.com	...	http://www.medicalstudent.com/
Nature Biotechnology		http://biotech.nature.com
Rochelink	...	http://www.rochelink.com.ar/
The Merck Manual of Geriatrics	...	http://www.merck.com/mrkshared/mmg/home.jsp
Texas Medical Center Library	...	http://www.library.tmc.edu/open/databases.html