Affiliation: | 1. Endoscopy Center, Suzaka Hospital, Nagano Prefectural Hospital Organization, 1332 Suzaka, Suzaka, Nagano, 382-0091, Japan 2. Department of Internal Medicine, Gastroenterology, Shinshu University School of Medicine, Matsumoto, Japan 3. Okudaira Clinic, Matsumoto, Japan 4. Department of Biomedical Sciences, School of Health Sciences, Shinshu University School of Medicine, Matsumoto, Japan
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