[1] Kyoto Univ, Grad Sch Med, Dept Prevent Serv, Kyoto, Japan
[2] Kyoto Univ, Sch Publ Hlth, Dept Prevent Serv, Kyoto, Japan
[3] Trauma Ctr, Osaka Gen Med Ctr, Dept Crit Care, Osaka, Japan
[4] Nagoya Daini Hosp, Dept Obstet & Gynecol, Japanese Red Cross Aichi Med Ctr, Nagoya, Japan
[5] Nagoya Daini Hosp, Dept Pediat, Japanese Red Cross Aichi Med Ctr, Nagoya, Japan
[6] Kyoto Univ, Dept Prevent Serv, Sch Publ Hlth, Yoshida konoe cho,Sakyo ku, Kyoto 6068315, Japan