1. Geisinger Medical Center, Department of Gastroenterology and Nutrition, Danville, Pennsylvania, United States
2. Winthrop University Hospital, Departments of Gastroenterology, Hepatology and Nutrition, Mineola, New York, United States
3. Indiana University, Department of Gastroenterology and Hepatology, Indianapolis, Indiana, United States
4. University of Alabama at Birmingham, Division of Gastroenterology and Hepatology, Birmingham, Alabama, United States
5. Florida Hospital, Center for Interventional Endoscopy, Orlando, Florida, United States
6. Yale University School of Medicine, Department of Medicine, Section of Digestive Diseases, New Haven, Connecticut, United States
7. Dartmouth-Hitchcock Medical Center, Department of Gastroenterology, Lebanon, New Hampshire, United States
8. Indiana University, Department of Pathology and Laboratory Medicine, Indianapolis, Indiana, United States