| Affiliation: | 1. Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan;2. Department of Gastroenterology and Hepatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan;3. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Okayama, Japan;4. Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo, Japan;5. Center of Gastroenterology, Onomichi General Hospital, Onomichi, Japan;6. Fourth Department of Internal Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan;7. First Department of Internal Medicine, Gifu University Hospital, Gifu, Japan |
