1. Department of Medicine Section of Gastroenterology King Faisal Specialist Hospital and Research Center Riyadh, Saudi Arabia
2. Department of Medicine Section of Gastroenterology King Faisal Specialist Hospital and Research Center
3. Department of Medicine (MBC 46) Section of Gastroenterology King Faisal Specialist Hospital and Research Center PO Box 3354 Riyadh 11211, Saudi Arabia