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机构:
Hokkaido Univ, Dept Gastroenterol & Hepatol, Fac Med, Sapporo, Hokkaido, Japan
Hokkaido Univ, Grad Sch Med, Sapporo, Hokkaido, Japan
Hokkaido Univ Hosp, Div Endoscopy, Sapporo, Hokkaido, Japan Hokkaido Univ, Dept Gastroenterol & Hepatol, Fac Med, Sapporo, Hokkaido, Japan