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机构:
Korea Univ, Div Gastroenterol, Dept Internal Med, Coll Med,Ansan Hosp, 123 Jeokgeum Ro, Ansan 425707, Gyeonggi Do, South Korea Korea Univ, Div Gastroenterol, Dept Internal Med, Coll Med,Guro Hosp, 148 Gurodong Ro, Seoul 152703, South Korea