1 Division of Critical Care Medicine and Trauma, National Hospital Organization Disaster Medical Center, 3256 Midori, Tachikawa, Tokyo 190-0014, Japan.
2 Emergency Medical Center, Kagawa University Hospital, 1750-1 Ikenobe, Miki, Kita, Kagawa 761-0793, Japan. Electronic address: hifumitoru@gmail.com.
3 Clinical research support center, Kagawa University Hospital, 1750-1 Ikenobe, Miki, Kita, Kagawa 761-0793, Japan.