1. Department of Neurosurgery, Toshiba Stroke Research Center, School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, New York
2. Department of Neurosurgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
3. Department of Neurosurgery, Department of Neurology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
4. Department of Neurology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania