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1. Department of Hematology and Oncology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan 2. Department of Gastroenterology, Fujieda Municipal General Hospital, 4-1-11 Surugadai, Fujieda, Shizuoka, 426-8677, Japan 3. Department of Surgery, Fujieda Municipal General Hospital, 4-1-11 Surugadai, Fujieda, Shizuoka, 426-8677, Japan 4. Department of Gastroenterology, Hamamatsu South Hospital, 26 Shirowa-cho, Minami-ku, Hamamatsu, Shizuoka, 430-0846, Japan