作者单位:Childrens Natl Hlth Syst, Dept Neurosurg, Washington, DC USA[1]Univ Calif San Diego, Dept Neurosurg, La Jolla, CA 92093 USA[2]Baylor Coll Med, Michael E DeBakey Dept Surg, Houston, TX 77030 USA[3]Massachusetts Gen Hosp, Dept Neurosurg, Boston, MA 02114 USA[4]Rady Childrens Hosp, Dept Neurol, San Diego, CA USA[5]