[1] Univ Calif San Francisco, Dept Radiat Oncol, San Francisco, CA 94143 USA
[2] London Reg Canc Ctr, Dept Radiat Oncol, London, ON N6A 4L6, Canada
[3] Univ Calif San Francisco, Dept Anesthesiol, San Francisco, CA 94143 USA
[4] Univ Calif San Francisco, Dept Pediat, San Francisco, CA 94143 USA
[5] Community Hosp Sacramento Med Syst, Dept Neurosurg, Sacramento, CA USA
[6] Community Hosp Sacramento Med Syst, Dept Pediat, Sacramento, CA USA
[7] Univ Amsterdam, Acad Med Ctr, Dept Radiotherapy, NL-1105 AZ Amsterdam, Netherlands
[8] Sutter CHS Med Syst, Pediat Neurosurg Serv, Sacramento, CA USA