1 Department of Traumatology and Acute Critical Medicine, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan. Electronic address: htomoya1979@hp-emerg.med.osaka-u.ac.jp.
2 Department of Traumatology and Acute Critical Medicine, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
3 Department of Medical Technology, Faculty of Health Sciences, Kobe Tokiwa University, Kobe-shi, Hyogo 653-0838, Japan.