| Affiliation: | 1. Hepato‐Biliary‐Pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan;2. Department of Health Economics and Epidemiology Research, School of Public Health, University of Tokyo, Tokyo, Japan;3. Department of Clinical Data Management and Research, Clinical Research Centre, National Hospital Organization Headquarters, Tokyo Medical and Dental University, Tokyo, Japan;4. Department of Health Care Informatics, Tokyo Medical and Dental University, Tokyo, Japan |
