[1] Hokkaido Univ, Fac Hlth Sci, Kita 12, Nishi 5, Kita Ku, Sapporo, Hokkaido 0600812, Japan
[2] Shanghai Jiao Tong Univ, Sch Nursing, Shanghai, Peoples R China
[3] Tokyo Metropolitan Univ, Grad Sch Human Hlth Sci, Tokyo, Japan
[4] Tohoku Univ Hosp, Emergency & Crit Care Ctr, Sendai, Japan