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机构:
Yonsei Univ, Coll Med, Severance Hosp, Div Gastroenterol, Seoul, South Korea
Yonsei Univ, Coll Med, Dept Internal Med, Seoul, South Korea
Hallym Univ, Coll Med, Hangang Sacred Heart Hosp, Div Gastroenterol,Dept Internal Med, Seoul, South Korea Yonsei Univ, Coll Med, Severance Hosp, Div Gastroenterol, Seoul, South Korea