[1] King Saud Univ, Coll Med, Liver Dis Res Ctr, POB 2925, Riyadh 11461, Saudi Arabia
[2] King Abdul Aziz Med City, Dept Med, Gastroenterol Unit, POB 9515, Jeddah 21423, Saudi Arabia
[3] Ibrahim Bin Hamad Obaidullah Hosp, Dept GI Endoscopy, Ras Al Khaymah, U Arab Emirates
[4] King Abdullah Med City, Dept Gastroenterol & Hepatol, Mecca, Saudi Arabia
[5] Cleveland Clin Abu Dhabi, Digest Dis Inst, Dept Gastroenterol & Hepatol, Abu Dhabi, U Arab Emirates
[6] King Abdul Aziz Med City, King Abdullah Int Med Res Ctr, Dept Med, Gastroenterol Unit, POB 9515, Jeddah 21423, Saudi Arabia