1. Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, United States.
2. Department of Neurosurgery, Erie County Medical Center, Buffalo, New York, United States.
3. Department of Diagnostic Radiology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, United States.
4. Department of Radiology, Eric County Medical Center, Buffalo, New York, United States.