1. Department of Gastroenterology and Hepatology National Hospital Organization Osaka National Hospital Osaka Japan
2. Department of Gastroenterology Osaka Rosai Hospital Osaka Japan
3. Department of Gastroenterology National Hospital Organization Kure Medical Center and Chugoku Cancer Center Hiroshima Japan
4. Department of Gastroenterology National Hospital Organization Disaster Medical Center Tokyo Japan
5. Department of Gastroenterology National Hospital Organization Tokyo Medical Center Tokyo Japan
6. Division of Gastroenterology and Hepatology, Department of Internal Medicine Keio University School of Medicine Tokyo Japan
7. Department of Gastroenterology National Hospital Organization Mie Chuo Medical Center Mie Japan
8. Department of Surgery National Hospital Organization Tsuruga Medical Center Fukui Japan
9. Clinical Research Center National Hospital Organization Nagoya Medical Center Aichi Japan
10. Department of Gastroenterology Clinical Research Institute, National Hospital Organization Kyushu Medical Center Fukuoka Japan