[1] Saitama Childrens Med Ctr, Div Hematol Oncol, Saitama 3398551, Japan
[2] Saitama Childrens Med Ctr, Div Infect Dis Immunol & Allergy, Saitama 3398551, Japan
[3] Saitama Childrens Med Ctr, Dept Radiol, Saitama 3398551, Japan
[4] Saitama Childrens Med Ctr, Dept Pathol, Saitama 3398551, Japan