1. Department of Forensic Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8553, Japan
2. Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, Kanagawa 259-1143, Japan
3. Ibaraki Prefectural Central Hospital, Ibaraki 309-1703, Japan
4. Chikusei City Medical Director, Ibaraki 308-8616, Japan