1. Department of Emergency Medicine Kasaoka Daiichi Hospital Kasaoka Okayama Japan
2. Department of Emergency, Critical Care, and Disaster Medicine Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences Kita Okayama Japan
3. Department of Medical Education Kurashiki Central Hospital Kurashiki Okayama Japan
4. Emergency and Critical Care Center Kurashiki Central Hospital Kurashiki Okayama Japan