1. Departments of Neurological Surgery, Reston, Virginia
2. Radiology, Reston, Virginia
3. Radiation Oncology, Reston, Virginia
4. University of Pittsburgh School of Medicine, and The Center for Image Guided Neurosurgery, Reston, Virginia
5. University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania; Health Technology Associates, Inc., Reston, Virginia
6. Washington, District of Columbia; and M. Green Associates (MG), Reston, Virginia