1 The Department of Emergency and Critical Care Medicine, Ehime University, Graduate School of Medicine, 454 Shitsukawa, Tohon, Ehime 791-0295, Japan. Electronic address: aibiki@m.ehime-u.ac.jp.
2 The Department of Emergency and Critical Care Medicine, Ehime University, Graduate School of Medicine, 454 Shitsukawa, Tohon, Ehime 791-0295, Japan.