1. Center for Clinical Research, Hamamatsu University School of Medicine, Japan
2. Division of Endoscopy, Hokkaido University Hospital, Japan
3. Department of Gastroenterology, Aichi Medical University School of Medicine, Japan
4. Department of Internal Medicine, Hitachi General Hospital, Japan
5. Department of Gastroenterology, Niigata City General Hospital, Japan
6. Department of Gastroenterology, Kagawa Prefectural Central Hospital, Japan
7. Department of Gastroenterology, Toshiba General Hospital, Japan
8. Department of Internal Medicine, Tokai University School of Medicine, Japan
9. Department of Gastroenterology (Gastroenterology Center), St. Luke's International Hospital, Japan
10. The Center for Liver Disease, Shin-Kokura Hospital, Japan
11. Department of Gastroenterology, Higashiyama Takeda Hospital, Japan
12. Department of Gastroenterology, Hokkaido University Graduate School of Medicine, Japan