Affiliation: | 1. Center for Health, Safety, and Environmental Management, Shinshu University, 3-1-1 Asahi, Matsumoto, 390-8621, Japan 2. Department of Gastroenterology and Hepatology, Kansai Medical University, Osaka, Japan 3. Department of Anatomic Pathology, Kurashiki Central Hospital, Kurashiki, Japan 4. Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai, Japan 5. Department of Gastroenterology and Hepatology, Graduate School of Tokyo Medical and Dental University, Tokyo, Japan
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