1. Department of Emergency and Critical Care Medicine Juntendo University Urayasu Hospital Urayasu Chiba Japan
2. Emergency and Critical Care Center Japan Organization of Occupational Health and Safety Yokohama Rosai Hospital Yokohama Kanagawa Japan
3. Department of Public Health Graduate school of Medicine Osaka University Suita Osaka Japan
4. Department of Emergency Medicine Nagoya Ekisaikai Hospital Nagoya Aichi Japan
5. Department of Emergency and Critical Care Medicine Tokyo‐bay Urayasu Ichikawa Medical Center Urayasu Chiba Japan
6. Department of Disaster and Emergency Medicine Kochi Medical School Nangoku Kochi Japan
7. Department of Emergency Medicine Nagoya City University Hospital Nagoya Aichi Japan