1. University of Texas at Houston, McGovern School of Medicine, Texas, United States
2. Mercer University School of Medicine, Internal Medicine, Macon, Georgia, United States
3. Boston University Medical Center, Medicine, Boston, Masschusetts, United States
4. John H. Stroger Hospital of Cook County, Medicine, Chicago, Illinois, United States
5. Parkview Health System, Advanced Interventional Oncology and Surgical Endoscopy, Fort Wayne, Indiana, United States
6. Wilkes-Barre General Hospital, Endoscopy, Wilkes-Barre, Pennsylvania, United States
7. CHI Health Creighton University Medical Center, Gastroenterology & Hepatology, Omaha, Nebraska, United States
8. University of Arkansas for Medical Sciences, Department of Medicin, Division of Gastroenterology & Hepatology, Little Rock, Arkansas, United States
9. University of Texas McGovern Medical School, Gastroenterology, Hepatology and Nutrition, Houston, Texas, United States