1 Neurosurgery, University at Buffalo Jacobs School of Medicine and Biomedical Sciences, Buffalo, New York, USA.
2 Neurosurgery, Gates Vascular Institute, Buffalo, New York, USA.
3 Health Science and Medicine, Eastern Virginia Medical School, Norfolk, Virginia, USA.
4 Neurosurgery, Gates Vascular Institute, Buffalo, New York, USA ELevy@ubns.com.
5 Neurosurgery and Radiology and Canon Stroke and Vascular Research Center, University at Buffalo Jacobs School of Medicine and Biomedical Sciences, Buffalo, New York, USA.