Affiliation: | 1. Department of General Internal Medicine, Hiroshima University Hospital, Hiroshima, Japan;2. Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan;3. Department of Medicine and Clinical Oncology, Graduate School of Medicine, Chiba University Hospital, Chiba, Japan;4. Department of Internal Medicine, Tokyo Metropolitan Komagome Hospital, Tokyo, Japan;5. Department of Gastroenterology, The University of Tokyo, Tokyo, Japan;6. Department of Gastroenterological Surgery, Tokai University Hospital, Tokyo, Japan;7. Department of Gastroenterology, Second Teaching Hospital, Fujita Health University, Nagoya, Japan |