1. Department of Gastroenterology, Graduate School of Medicine The University of Tokyo Tokyo Japan
2. Division of Gastroenterology and Hepatology, Department of Internal Medicine Nihon University School of Medicine Tokyo Japan
3. Department of Health Services Research, Graduate School of Medicine The University of Tokyo Tokyo Japan
4. Department of Hepato‐Biliary‐Pancreatic Medicine The Cancer Institute Hospital of Japanese Foundation for Cancer Research Tokyo Japan
5. Department of Respiratory Medicine, Graduate School of Medicine The University of Tokyo Tokyo Japan
6. Department of Clinical Epidemiology and Health Economics, School of Public Health The University of Tokyo Tokyo Japan
7. Department of Health Informatics and Policy, Graduate School of Medicine Tokyo Medical and Dental University Tokyo Japan
8. Department of Endoscopy and Endoscopic Surgery The University of Tokyo Hospital Tokyo Japan