Affiliation: | 1. Center for Therapeutic Endoscopy and Endoscopic Oncology, St Michael''s Hospital, University of Toronto, Toronto, Ontario, Canada;3. Division of Gastroenterology, Duke University, Durham, and Duke Clinical Research Institute, Durham, North Carolina;4. Department of Medicine, Michael E. DeBakey VA Medical Center, Baylor College of Medicine, Houston, Texas;6. Division of Gastroenterology and Nutrition, Loyola University Health System, Maywood, Illinois |