[1] Univ Yamanashi, Sch Med, Dept Pediat, Chuo, Japan
[2] Univ Tokyo, Grad Sch Med, Dept Pediat, Tokyo, Japan
[3] Hiroshima Univ, Grad Sch Biomed Sci, Dept Pediat, Hiroshima, Japan
[4] Natl Res Inst Child Hlth & Dev, Dept Maternal Fetal Biol, Tokyo, Japan
[5] Natl Res Inst Child Hlth & Dev, Dept Pediat Hematol & Oncol Res, Tokyo, Japan
[6] Saitama Childrens Med Ctr, Dept Hematol Oncol, Saitama, Japan
[7] Kyoto Prefectural Univ Med, Grad Sch Med Sci, Dept Pediat, Kyoto, Japan
[8] Natl Hosp Org, Nagoya Med Ctr, Clin Res Ctr, Nagoya, Aichi, Japan
[9] Kyoto Univ, Grad Sch Med, Dept Pediat, Kyoto, Japan