[1] Osaka City Univ, Grad Sch Med, Osaka 558, Japan
[2] Natl Ctr Child Hlth & Dev, Tokyo, Japan
[3] Osaka Univ, Grad Sch Med, Osaka, Japan
[4] Japanese Red Cross Nagoya Daiichi Hosp, Childrens Med Ctr, Nagoya, Aichi, Japan
[5] Gifu Univ, Gifu, Japan
[6] Tokai Univ, Isehara, Kanagawa, Japan
[7] Nippon Univ, Tokyo, Japan
[8] Izumi City Hosp, Izumi, Japan
[9] Tokyo Komagome Hosp, Tokyo, Japan