[1] Imam Abdulrahman Bin Faisal Univ, Coll Med, Dammam, Saudi Arabia
[2] King Faisal Specialist Hosp & Res Ctr, Div Gastroenterol & Hepatol, Dept Internal Med, POB 3354, Riyadh 11211, Saudi Arabia
[3] Alfaisal Univ, Coll Med, Riyadh, Saudi Arabia
[4] King Abdulaziz Univ, King Abdulaziz Univ Hosp, Dept Internal Med, Inflammatory Bowel Dis Unit, Jeddah, Saudi Arabia
[5] King Fahad Specialist Hosp, Dept Med, Dammam, Saudi Arabia
[6] Yale Sch Med, Dept Internal Med, Sect Digest Dis, New Haven, CT USA