| Affiliation: | 1. Department of Infectious Diseases, Kyorin University School of Medicine, Mitaka, Tokyo, Japan;2. Department of Gastroenterology, National Hospital Organization Hakodate Hospital, Hakodate, Japan;3. Division of Endoscopy, Hokkaido University Hospital, Sapporo, Japan;4. Department of General Medicine and Community Health Science, Hyogo College of Medicine, Sasayama, Hyogo, Japan;5. Ibaraki Prefectural Central Hospital, Ibaraki, Japan;6. Department of Gastroenterology, Yokohama City University, Yokohama, Japan |
