[1] Hokkaido Univ Hosp, Emergency & Crit Care Ctr, Sapporo, Hokkaido 0608648, Japan
[2] Osaka Gen Med Ctr, Dept Emergency & Crit Care, Osaka, Japan
[3] Jikei Univ, Sch Med, Dept Anesthesiol, Intens Care Unit, Osaka, Japan
[4] Tohoku Univ, Grad Sch Med, Div Emergency & Crit Care Med, Sendai, Miyagi 980, Japan
[5] Jichi Med Univ, Saitama Med Ctr, Dept Anesthesiol & Crit Care Med, Saitama, Japan
[6] Osaka Univ, Grad Sch Med, Dept Anesthesiol & Intens Care Med, Suita, Osaka 565, Japan
[7] Univ Occupat & Environm Hlth, Dept Emergency Med, Saitama, Japan
[8] Hokkaido Univ Hosp, Clin Res & Med Innovat Ctr, Sapporo, Hokkaido 0608648, Japan
[9] Shonan Kamakura Gen Hosp, Dept Crit Care, Saitama, Japan