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Natl Canc Ctr Hosp East, Dept Gastroenterol, Endoscopy Div, 6-5-1 Kashiwanoha, Kashiwa, Chiba 2778577, Japan
Jikei Univ, Sch Med, Dept Internal Med, Div Gastroenterol & Hepatol, Tokyo 1058461, Japan Natl Canc Ctr Hosp East, Dept Gastroenterol, Endoscopy Div, 6-5-1 Kashiwanoha, Kashiwa, Chiba 2778577, Japan