[1] Case Western Reserve Univ, Sch Med, Case Comprehens Canc Ctr, Cleveland, OH 44106 USA
[2] Cent Brain Tumor Registry US, Hinsdale, IL USA
[3] Rainbow Babies & Childrens Hosp, Dept Pediat Hematol Oncol, Cleveland, OH 44106 USA
[4] Case Western Reserve Univ, Frances Payne Bolton Sch Nursing, Cleveland, OH 44106 USA
[5] Case Western Reserve Univ, Sch Med, Cleveland, OH USA
[6] Nationwide Childrens Hosp, Dept Hematol & Oncol, Columbus, OH USA
[7] Cleveland Clin Childrens Hosp, Dept Pediat Hematol & Oncol, Cleveland, OH USA