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机构:
King Saud Univ, King Khalid Univ Hosp, Div Gastroenterol, Dept Med, POB 2925 59, Riyadh 11461, Saudi Arabia
McGill Univ, Montreal Gen Hosp, McGill Univ Hlth Ctr, Div Gastroenterol, Montreal, PQ, Canada King Saud Univ, King Khalid Univ Hosp, Div Gastroenterol, Dept Med, POB 2925 59, Riyadh 11461, Saudi Arabia