1. Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania , Philadelphia, PA, United States
2. Laboratory of Pathology, National Cancer Institute, Center for Cancer Research , Bethesda, MD, United States
3. Department of Neurosurgery, University of Pennsylvania Perelman School of Medicine , Philadelphia, PA, United States
4. Department of Medicine, Perelman School of Medicine at the University of Pennsylvania , Philadelphia, PA, United States
5. Department of Neuroradiology, Hospital of the University of Pennsylvania , Philadelphia, PA, United States
6. Department of Radiation Oncology, Perelman School of Medicine, University of Pennsylvania , Philadelphia, PA, United States