[1] Gunma Univ, Dept Pediat, Grad Sch Med, Maebashi, Gunma, Japan
[2] Gunma Childrens Med Ctr, Dept Hematol & Oncol, Shibukawa, Japan
[3] Yokohama City Univ Med, Dept Pediat, Yokohama, Kanagawa, Japan
[4] Natl Res Inst Child Hlth & Dev, Dept Pediat Hematol & Oncol Res, Tokyo, Japan
[5] Natl Ctr Child Hlth & Dev, Childrens Canc Ctr, Tokyo, Japan
[6] Kyoto Prefectural Univ Med, Dept Mol Diagnost & Therapeut, Kyoto, Japan
[7] St Marianna Univ, Dept Pediat, Sch Med, Kawasaki, Kanagawa, Japan
[8] Natl Hosp Org, Dept Pediat, Osaka Med Ctr, Osaka, Japan
[9] Natl Hosp Org, Nagoya Med Ctr, Clin Res Ctr, Nagoya, Aichi, Japan
[10] Shiga Univ Med Sci, Dept Pediat, Otsu, Shiga, Japan
[11] Kyoto Univ, Grad Sch Med, Dept Human Hlth Sci, Kyoto, Japan
[12] Gunma Red Cross Blood Ctr, Maebashi, Gunma, Japan