1. 1Department of Radiation Oncology, Northwestern Medicine Lou and Jean Malnati Brain Tumor Institute, Northwestern University Robert H. Lurie Comprehensive Cancer Center, Chicago, Illinois.
2. 2Northwestern Medicine Malnati Brain Tumor Institute of the Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
3. 3Department of Neurological Surgery, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.