| Affiliation: | 1. Department of Gastroenterology and Hepatology, Hokkaido University Hospital, Sapporo, Hokkaido, JapanKazunori Eto and Hiroshi Kawakami contributed equally to this work.;2. Department of Gastroenterology, NTT East Japan Sapporo Hospital, Sapporo, Hokkaido, Japan;3. Department of Gastroenterology, Municipal Hakodate Hospital, Hakodate, Hokkaido, Japan;4. Department of Gastroenterology, Oji General Hospital, Tomakomai, Hokkaido, Japan;5. Center for Gastroenterology, Teine‐Keijinkai Hospital, Sapporo, Hokkaido, Japan;6. Department of Medical Oncology and Hematology, Sapporo Medical University Hospital, Sapporo, Hokkaido, Japan;7. Department of Gastroenterology, Japanese Red Cross Kitami Hospital, Kitami, Japan;8. Department of Internal Medicine and Gastroenterology, Abashiri‐Kosei General Hospital, Abashiri, Hokkaido, Japan;9. Third Department of Internal Medicine, Obihiro Kosei General Hospital, Obihiro, Hokkaido, Japan;10. Gastroenterology Center, Sapporo Higashi Tokushukai Hospital, Sapporo, Hokkaido, Japan;11. Department of Gastroenterology, Sapporo Hokushin Hospital, Sapporo, Hokkaido, Japan;12. Department of Gastroenterology and Hepatology, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan |
