1. Second Department of Internal Medicine, Wakayama Medical University, 811-1 Kimiidera, Wakayama 641-0012, Japan
2. Clinical Study Support Center, Wakayama Medical University Hospital, Wakayama 641-0012, Japan
3. Department of Gastroenterology and Gastroenterological Oncology, Fujita Health University School of Medicine, Toyoake 470-1192, Japan
4. First Department of Internal Medicine, Gifu University Hospital, Gifu 501-1194, Japan
5. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Okayama 700-8558, Japan
6. Center for Gastroenterology, Teine Keijinkai Hospital, Sapporo 006-8555, Japan
7. Division of Gastroenterology, Tohoku University Graduate School of Medicine, Toyoake 980-8574, Japan
8. Gastroenterological Center, Yokohama City University Medical Center, Yokohama 232-0024, Japan
9. Department of Gastroenterology and Hepatology, University Graduate School of Medicine, Nagoya 466-8550, Japan
10. Division of Gastroenterology and Hepatobiliary and Pancreatic Diseases, Department of Internal Medicine, Hyogo Medical University, Nishinomiya 663-8501, Japan
11. Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan
12. Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Osaka 589-8511, Japan