[1] Natl Res Inst Child Hlth & Dev, Dept Pediat Hematol & Oncol Res, Setagaya Ku, Tokyo 1578535, Japan
[2] Keio Univ, Sch Med, Dept Pediat, Tokyo, Japan
[3] St Lukes Int Hosp, Dept Pediat, Chuo Ku, Tokyo, Japan
[4] Tokyo Med & Dent Univ, Hosp Med, Dept Transfus Med, Tokyo, Japan
[5] Univ Yamanashi, Dept Pediat, Sch Med, Chuo Ku, Yamanashi, Japan
[6] Natl Canc Ctr, Div Pediat Oncol, Chuo Ku, Tokyo, Japan