[1] Nagano Childrens Hosp, Dept Hematol Oncol, 3100 Toyoshina, Azumino, Nagano 3998288, Japan
[2] Shinshu Univ, Dept Pediat, Sch Med, Matsumoto, Nagano, Japan
[3] Nagano Childrens Hosp, Dept Gen Pediat, Azumino, Japan
[4] Nagano Childrens Hosp, Dept Lab Med, Azumino, Japan
[5] Nagano Childrens Hosp, Life Sci Res Ctr, Azumino, Japan
[6] Matsumoto Dent Univ, Dept Pediat, Sch Dent, Shiojiri, Japan