1. Division of Digestive Diseases, Mount Sinai Beth Israel Medical Center, New York, New York, USA
2. Division of Gastroenterology, The Brooklyn Hospital Center, Brooklyn, New York, USA
3. Division of Gastroenterology, Doylestown Hospital, Doylestown, Pennsylvania, USA
4. Department of Surgical Pathology, Mount Sinai Beth Israel Medical Center, New York, New York, USA