1. First Department of Internal Medicine, Gifu University Hospital, Gifu
2. Department of Gastroenterology, Kitasato University East Hospital, Sagamihara
3. Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo
4. Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo
5. Department of Gastroenterology, Japan Red Cross Date General Hospital, Date
6. Department of Gastroenterology, Mie University Hospital, Tsu
7. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama
8. Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai
9. Division of Gastroenterology, Yokohama City University School of Medicine, Yokohama
10. Department of Gastroenterology, Fukushima Medical University Aizu Medical Center, Aizu
11. Department of Medicine and Bioregulatory Science, Graduate School of Medical Science, Kyushu University, Fukuoka
12. Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume
13. Department of Gastroenterology and Hepatology, Kinki University School of Medicine, Osaka-Sayama
14. Department of Gastroenterology and Hepatology, Hokkaido University Graduate School of Medicine, Sapporo
15. Fourth Department of Internal Medicine, Sapporo Medical University School of Medicine, Sapporo
16. Department of Gastroenterology, Gifu Municipal Hospital, Gifu
17. Department of Surgery, Jichi Medical University, Tochigi, Japan