1. Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;
2. Department of Neurosurgery, Lariboisière Hospital, Paris, France;
3. Department of Neurosurgery, Brown University, Providence, Rhode Island;
4. Department of Radiation Oncology, Harvard Medical School, Boston, Massachusetts,
5. Department of Neurological Surgery, Mayo Clinic, Rochester, Minnesota; and
6. Department of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, Texas