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King Saud Univ, King Khalid Univ Hosp, Dept Med 59, Div Gastroenterol, Gastroenterol Unit, Riyadh 11461, Saudi Arabia King Saud Univ, King Khalid Univ Hosp, Dept Med 59, Div Gastroenterol, Gastroenterol Unit, Riyadh 11461, Saudi Arabia