[1] Nara Med Univ, Dept Pediat, Kashihara, Nara 634, Japan
[2] St Marianna Univ, Sch Med, Dept Pediat, Kawasaki, Kanagawa, Japan
[3] Nagoya Univ Hosp, Dept Transfus Med, Nagoya, Aichi, Japan
[4] Yamaguchi Univ, Dept Pediat, Ube, Yamaguchi 755, Japan
[5] Ogikubo Hosp, Dept Hemalot, Tokyo, Japan
[6] Sapporo Tokushukai Hosp, Dept Pediat, Sapporo, Hokkaido, Japan
[7] Shizuoka Children Hosp, Dept Hematol Oncol, Shizuoka, Japan
[8] Tokyo Med Univ, Dept Lab Med, Tokyo 1608402, Japan