1. Department of Internal Medicine, University of Minnesota Medical Center, Minneapolis, MN
2. Advanced Endoscopy, Digestive Disease & Surgery Institute, Cleveland Clinic, Cleveland, OH
3. Advanced Endoscopy, Division of Gastroenterology, Minneapolis Veterans Affairs Medical Center, Minneapolis, MN
4. Advanced Endoscopy, Division of Gastroenterology & Hepatology, Regions Hospital, St. Paul, MN