Affiliation: | 1. Department of Gastroenterology and Oncology, Institute of Health Biosciences, University of Tokushima Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, 770-8503, Japan 2. Department of Medical Oncology and Hematology, Sapporo Medical University School of Medicine, South-1, West-16, Chuo-ku, Sapporo, 060-8543, Japan 3. Division of Gastroenterology, Hokkaido Cancer Center, 4-2-3-54, Kikusui, Shiroishi-ku, Sapporo, 003-0804, Japan 4. Division of Gastroenterology, Otaru Ekisaikai Hospital, 1-10-17, Shikinai, Otaru, 047-0031, Japan 5. Department of Gastroenterology, Oji General Hospital, 3-4-8, Wakakusa-cho, Tomakomai, 053-0021, Japan 6. Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, South-1, West-16, Chuo-ku, Sapporo, 060-8543, Japan
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