1. Department of Clinical Data Management and Research Clinical Research Center National Hospital Organization Headquarters Meguro Japan
2. Department of Health Services Research Graduate School of Medicine The University of Tokyo Bunkyo Japan
3. Department of Drug Safety and Risk Management School of Pharmacy Tokyo University of Pharmacy and Life Sciences Hachioji Japan
4. Clinical Research Center National Hospital Organization Nagasaki Medical Center Omura Japan
5. Department of Gastroenterology National Hospital Organization Ureshino Medical Center Ureshino Japan
6. Department of Clinical Research National Hospital Organization Yokohama Medical Center Yokohama Japan
7. Department of Hepato‐Biliary‐Pancreatology National Hospital Organization Kyushu Cancer Center Fukuoka Japan
8. Department of Gastroenterology National Hospital Organization Kyoto Medical Center Kyoto Japan
9. Department of Gastroenterology National Hospital Organization Takasaki General Medical Center Takasaki Japan
10. Department of Gastroenterology National Hospital Organization Sendai Medical Center Sendai Japan
11. Department of Gastroenterology National Hospital Organization Oita Medical Center Oita Japan
12. Department of Gastroenterology National Hospital Organization Tokyo National Hospital Kiyose Japan
13. Department of Gastroenterology and Hepatology National Hospital Organization Beppu Medical Center Beppu Japan
14. Department of Clinical Epidemiology and Health Economics School of Public Health The University of Tokyo Bunkyo Japan
15. Department of Health Policy and Informatics Tokyo Medical and Dental University Graduate School Bunkyo Japan