1. Senior Registrar, Department of Medicine, Riyadh Armed Forces Hospital, P.O. Box 7897, Riyadh 11159, Saudi Arabia
2. Head, Division of Gastroenterology, Department of Medicine, Riyadh Armed Forces Hospital, P.O. Box 7897, Riyadh 11159, Saudi Arabia
3. Consultant Gastroenterologist, Department of Medicine, Riyadh Armed Forces Hospital, P.O. Box 7897, Riyadh 11159, Saudi Arabia
4. Registrar, Division of Gastroenterology, Department of Medicine, Riyadh Armed Forces Hospital, P.O. Box 7897, Riyadh 11159, Saudi Arabia