1. Department of Emergency Medicine Southern Tohoku General Hospital Kohriyama Fukushima Japan
2. TXP Medical Co. Ltd. Chuo‐ku Tokyo Japan
3. Department of Public Health Graduate School of Medicine The University of Tokyo Bunkyo‐ku Tokyo Japan
4. Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo Japan
5. Public Health Osaka University Graduate School of Medicine Suita Osaka Japan
6. Department of Emergency and Critical Care Medicine Hitachi General Hospital Hitachi Ibaraki Japan
7. Department of Clinical Epidemiology and Health Economics School of Public Health The University of Tokyo Bunkyo‐ku Tokyo Japan