1 University of Pennsylvania, Philadelphia, Pennsylvania, USA redir90@gmail.com.
2 Barrow Neurological Institute, Phoenix, Arizona, USA.
3 Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, USA.
4 Department of Neurosurgery, Wake Forest University, Winston-Salem, North Carolina, USA.
5 Neuroscience Institute, Division of Neurointerventional Surgery, Queen's Medical Center, Honolulu, Hawaii, USA.
6 Department of Neurosurgery and Radiology, University of Miami Leonard M Miller School of Medicine, Miami, Florida, USA.
7 Department of Radiology, Mayo Clinic Minnesota, Rochester, Minnesota, USA.
8 Department of Neurosurgery, University of Tennessee Health Science Center, Memphis, Tennessee, USA.
9 Mallinckrodt Institute of Radiology, Washington University School of Medicine in Saint Louis, St Louis, Missouri, USA.
10 Department of Neurosurgery, Washington University Saint Louis School of Medicine, Saint Louis, Missouri, USA.
11 Neurosurgery and Radiology and Canon Stroke and Vascular Research Center, University at Buffalo Jacobs School of Medicine and Biomedical Sciences, Buffalo, New York, USA.
12 Department of Neurosurgery, Gates Vascular Institute, Buffalo, New York, USA.
13 Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
14 Department of Neurosurgery, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
15 Department of Neurosurgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA.