American Gastroenterological Association
http://www.gastro.org/

American Journal of Gastroenterology
http://www-east.elsevier.com/ajg/

American Society For Gastrointestinal Endoscopy
http://www.asge.org/

Asociación Española de Gastroenterología
http://www.aegastro.es/

Asociación Española para el Estudio del Hígado
http://www.aeeh.org/

Digestive Disorders Foundation
http://www.digestivedisorders.org.uk/

European Association for Endoscopic Surgery
http://www.europeanaes.org/

Gastroenterology
http://www.gastrojournal.org/

Gastroenterología.net
http://www.gastroenterologia.net/

Gastroenterology Therapy Online
http://www.gastrotherapy.com/

Hepatology
http://hepatology.aasldjournals.org/

Laparoscopia
http://laparoscopia.org/

Laparoscopy.com
http://www.laparoscopy.com/

Online Laparoscopic Technical Manual
http://www.transmed.net/lapnet/lapmenu.htm/

Sociedad Española de Patología Digestiva
http://www.sepd.org/

Hepnet: The Hepatitis Information Network in the web
http://www.hepnet.com/

The Hepatitis Information Network
http://www.hepnet.co