American College of Gastroenterology 
Organization involved in study and treatment of disorders of the gastrointestinal tract. 

American Gastroenterological Association
The American Gastroenterological Association (AGA) is dedicated to the mission of advancing the science and practice of gastroenterology.

American Journal of Gastroenterology 
The home page of the American Journal of Gastroenterology. 

American Society for Gastrointestinal Endoscopy (ASGE)
Patient-focused site includes FAQ and information about colonoscopy and endoscopy. 

Medscape Gastroenterology 
A free resource for physicians, featuring gastroenterology CME (Continuing Medical Education) and gastroenterology medical information. 

The Society of Gastroenterology Nurses and Associates
Dedicated to the safe and effective practice of gastroenterology and endoscopy nursing.

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