1. Department of Disaster and Emergency Medicine, Graduate School of Medicine, Kobe University, Kobe City 650-0017, Japan
2. Department of Anesthesiology, Ohta General Hospital Foundation, Ohta Nishinouchi Hospital, Koriyama City 963-8558, Japan
3. Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, Fukushima City 960-1295, Japan