1. From the Department of Medicine, Division of Gastroenterology and Hepatology, Riyadh Military Hospital, Riyadh, Saudi Arabia; King Fahad General Hospital, Jeddah, Saudi Arabia
2. Integrated Department of Gastroenterology, Bradford Teaching Hospitals National Health Service Trust, United Kingdom, Saudi Arabia
3. King Fahad General Hospital, Jeddah, Saudi Arabia
4. Total Quality Management, Riyadh Military Hospital, Riyadh, Saudi Arabia