1 Department of Neurosurgery, University of Illinois at Chicago, Chicago, Illinois, USA.
2 Departments of Neurosurgery and Radiology, School of Medicine and Biomedical Sciences, University of Buffalo, State University of New York, Buffalo, New York, USA.
3 Gates Vascular Institute, Kaleida Health, Buffalo, New York, USA.
4 Department of Neurology, Medical University of South Carolina, Charleston, South Carolina, USA.
5 Department of Neurosurgery, State University of New York at Stony Brook, Stony Brook, New York, USA.
6 Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
7 Department of Radiology, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA.