Institution: | 1. Department of Internal Medicine, Kurosawa Hospital, Obihiro, Japan 2. Department of Endoscopic Diagnostics and Therapeutics, Kurosawa Hospital, Obihiro, Japan 4. Department of Gastroenterology, Kurosawa Hospital, 4 chome 1, Odori Minami, Obihiro, Hokkaido, 080-0010, Japan 3. Department of Radiology, Obihiro Kousei Hospital, Obihiro, Japan
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