Amer A Alkhatib1, Ala Abdel Jalil2, M E Harrison3. 1. Cancer Treatment Centers of America, Division of Gastroenterology, Oklahoma State University, Tulsa, Oklahoma, USA. 2. McLeod Regional Medical Center, Department of Internal Medicine, Florence, South Carolina, USA. 3. Division of Gastroenterology, Mayo Clinic, Scottsdale, Arizona, USA.