American Society for Gastrointestinal Endoscopy
http://www.askasge.org/
American Association for the Study of Liver Disease
http://www.aasld.org/
American Gastroenterological Association
http://www.gastro.org/
American Society for Parenteral and Enteral Nutrition
http://www.clinnutr.org/
Celiac Disease Foundation
http://www.celiac.org/
Celiac Sprue Association
http://www.csaceliacs.org/
Crohn's & Colitis Foundation of America
http://www.ccfa.org/
International Conference for Capsule Endoscopy
http://www.icce.info/
http://www.capsuleendoscopy.org
International Foundation for Functional Gastrointestinal Disorders
http://www.iffgd.org/
Irritable Bowel Syndrome Association
http://www.ibsassociation.org/
North American Society for Pediatric Gastroenterology, Hepatology and Nutrition
www.naspghan.org/sub/publicinformation.asp
Society of American Gastrointestinal Endoscopic Surgeons
http://www.sages.org/