1. Department of Emergency Medicine, Hiroshima City Hiroshima Citizens Hospital, 7-33 Motomachi, Naka-ku, Hiroshima City, Hiroshima 730-8518, Japan
2. Department of Emergency Medicine, Hiroshima City Hiroshima Citizens Hospital, Hiroshima City, Hiroshima, Japan
3. Department of Emergency Medicine, International University of Health and Welfare, Narita city, Chiba, Japan
4. Department of Forensic Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan