1. College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
2. Department of Surgery, Section of Liver & Small Bowel Transplantation & Hepatobiliary-Pancreatic Surgery, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
3. Department of Medicine, Section of Gastroenterology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia