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机构:
Univ Western Ontario, Dept Med, Div Gastroenterol, London Hlth Sci Ctr, London, ON, Canada
King Saud Univ, King Khalid Univ Hosp, Dept Med, Riyadh, Saudi Arabia
Univ Western Ontario, Dept Pathol, London Hlth Sci Ctr, London, ON, Canada Univ Western Ontario, Dept Med, Div Gastroenterol, London Hlth Sci Ctr, London, ON, Canada