1. Department of Emergency and Critical Care Medicine Sendai City Hospital Sendai Japan
2. Division of Emergency and Critical Care Medicine Tohoku University Graduate School of Medicine Sendai Japan
3. Department of Emergency and Critical Care Medicine Tohoku University Hospital Sendai Japan
4. Department of Emergency and Critical Care Medicine Wakayama Medical University Wakayama Japan
5. Department of Community Emergency Medicine Hyogo College of Medicine Nishinomiya Japan
6. Department of Clinical Epidemiology Hyogo College of Medicine Nishinomiya Japan
7. Osaka Prefectural Nakakawachi Emergency and Critical Care Center Higashiosaka Japan