1. Department of Internal Medicine, Wayne State University School of Medicine, Detroit, Michigan, United States
2. Developmental Endoscopy Lab, Brigham and Women’s Hospital, Boston, Massachusetts, United States
3. Brigham and Women’s Hospital, Boston, Massachusetts, United States
4. Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States
5. Division of Gastroenterology, Brigham and Women’s Hospital, Boston, Massachusetts, United States