1. Department of Emergency and Critical Care Medicine Dokkyo Medical University Tochigi Japan
2. Data Science Center Jichi Medical University Tochigi Japan
3. Department of Clinical Epidemiology and Health Economics, School of Public Health The University of Tokyo Tokyo Japan
4. Emergency and Critical Care Center Tokyo Metropolitan Hiroo Hospital Tokyo Japan
5. Department of Health Policy and Informatics Tokyo Medical and Dental University Graduate School of Medicine Tokyo Japan