[1] Yokohama City Univ, Sch Med, Dept Paediat, Yokohama, Kanagawa 2360004, Japan
[2] Yokohama City Univ, Med Ctr, Dept Paediat, Yokohama, Kanagawa 2360004, Japan
[3] Kagoshima Univ, Sch Hlth Sci, Kagoshima 890, Japan
[4] Aichi Childrens Hlth & Med Ctr, Aichi, Japan
[5] Miyagi Childrens Hosp, Sendai, Miyagi, Japan
[6] Osaka Med Coll, Dept Paediat, Osaka, Japan
[7] Kobe Childrens Hosp, Kobe, Hyogo, Japan
[8] Chiba Univ, Grad Sch Med, Dept Paediat, Chiba, Japan
[9] Wakayama Med Univ, Lab Immune Regulat, Osaka, Japan
[10] Osaka Univ, Immunol Frontier Res Ctr, Osaka, Japan