1. Canon Stroke and Vascular Research Center, University at Buffalo, Buffalo, NY 14203, USA
2. Department of Neurosurgery, University at Buffalo, Buffalo, NY 14203, USA
3. Department of Radiology, University of California Los Angeles, Los Angeles, CA 90095, USA
4. Department of Pathology and Anatomical Sciences, University at Buffalo, Buffalo, NY 14203, USA
5. Neuroendovascular Program, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
6. Department of Neurosurgery, University of Pennsylvania, Philadelphia, PA 19104, USA
7. Department of Neurosurgery, University of South Florida, Tampa, FL 33620, USA