1 Center for Advanced Endoscopy, Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
2 Department of Internal Medicine, The University of Texas Medical Branch, Galveston, Texas.
3 Columbia Heart Clinic, Columbia, South Carolina.
4 Division of Gastroenterology, West Virginia University, Charleston Area Medical Center, Charleston, West Virginia.
5 Division of Gastroenterology and Hepatology, The University of Texas Medical Branch, Galveston, Texas.
6 Catalyst Medical Consulting, Simpsonville, South Carolina; Division of Gastroenterology, Department of Internal Medicine, University of South Carolina School of Medicine, Columbia, South Carolina, USA.