[1] Washington Univ, Sch Med, Dept Neurol, St Louis, MO 63110 USA
[2] St Louis Childrens Hosp, Dept Neurosurg, St Louis, MO 63178 USA
[3] St Louis Childrens Hosp, Dept Pathol & Immunol, St Louis, MO 63178 USA
[4] St Louis Childrens Hosp, Dept Pediat, St Louis, MO 63110 USA
[5] St Louis Childrens Hosp, Div Hematol Oncol & Neurol, St Louis, MO 63110 USA