[1] Kanagawa Childrens Med Ctr, Dept Gen Med, Yokohama, Kanagawa, Japan
[2] Yokohama City Western Child Consultat Ctr, Yokohama, Kanagawa, Japan
[3] Yokohama City Southern Child Consultat Ctr, Yokohama, Kanagawa, Japan
[4] Child First Japan, Isehara, Kanagawa, Japan
[5] Asahi Gen Hosp, Dept Pediat, Asahi, Chiba, Japan
[6] Kyoto Prefectural Univ Med, Dept Emergency Med, Kyoto, Kyoto, Japan
[7] Natl Ctr Neurol & Psychiat, Dept Pediat, Kodaira, Tokyo, Japan
[8] Tokyo Univ Technol, Sch Hlth Sci, Dept Nursing, Hachioji, Japan
[9] Natl Ctr Child Hlth & Dev, Dept Psychosocial Med, Setagaya Ku, Tokyo, Japan
[10] Nishisaitama Chuo Natl Hosp, Dept Pediat, Tokorozawa, Saitama, Japan
[11] Maebashi Red Cross Hosp, Dept Pediat, Maebashi, Gunma, Japan
[12] Kitakyushu City Yahata Hosp, Dept Emergency Med, Kitakyushu, Fukuoka, Japan