1. School of Medicine, University of Pittsburgh Medical Center, 200 Lothrop Street, Pennsylvania, PA 15213, USA
2. Center for Image-Guided Neurosurgery, University of Pittsburgh Medical Center, 200 Lothrop Street, Pennsylvania, PA 15213, USA
3. Department of Neurological Surgery, University of Pittsburgh Medical Center, 200 Lothrop Street, Pennsylvania, PA 15213, USA
4. Department of Radiation Oncology, University of Pittsburgh Medical Center, 200 Lothrop Street, Pennsylvania, PA 15213, USA