[1] Nagoya Univ, Grad Sch Med, Dept Pediat, Nagoya, Japan
[2] Japanese Red Cross Aichi Med Ctr Nagoya First Hos, Childrens Med Ctr, Dept Hematol & Oncol, Nagoya, Japan
[3] Hiroshima Univ, Dept Pediat, Grad Sch Biomed & Hlth Sci, Hiroshima, Japan
[4] Japanese Red Cross Narita Hosp, Dept Pediat Hematol & Oncol, Narita, Japan
[5] Okinawa Prefectural Nanbu Med Ctr, Div Pediat Hematol Oncol, Haebaru, Okinawa, Japan
[6] Childrens Med Ctr, Haebaru, Okinawa, Japan
[7] Kobe Univ, Grad Sch Med, Dept Pediat, Kobe, Japan
[8] Fujita Hlth Univ, Sch Med, Dept Pediat, Toyoake, Japan
[9] Kitano Hosp, Tazuke Kofukai Med Res Inst, Dept Pediat, Osaka, Japan
[10] Shizuoka Childrens Hosp, Dept Hematol & Oncol, Shizuoka, Japan
[11] Shizuoka Childrens Hosp, Dept Pathol, Shizuoka, Japan
[12] Japanese Red Cross Aichi Med Ctr, Nagoya Hosp 1, Dept Pathol, Nagoya, Aichi, Japan
[13] Nagoya City Univ, Grad Sch Med Sci & Med Sch, Dept Virol, Nagoya, Aichi, Japan