1. Department of Emergency, Disaster and Critical Care Medicine, Kagawa University Hospital, Kagawa, Japan.
2. Department of Emergency Medicine, Tokuyama Central Hospital, Yamaguchi, Japan.
3. Advanced Medical Emergency and Critical Care Center, Yamaguchi University School of Medicine, Yamaguchi, Japan.
4. Department of Emergency Medicine, School of Medicine, Jikei University, Tokyo, Japan.
5. Yamaguchi Prefectural Grand Medical Center, Yamaguchi, Japan.