1. Department of Diagnostic Imaging (J.M.O., M.D.H., M.G.), Cumming School of Medicine, University of Calgary, Alberta, Canada.
2. Department of Clinical Neurosciences (J.M.O., W.K.D., A. Ganesh, M.D.H., M.G.), Cumming School of Medicine, University of Calgary, Alberta, Canada.
3. Neurology Department, Hospital Moinhos de Vento, Porto Alegre, Brazil (S.M.).
4. Departments of Radiology and Neurology, Boston Medical Center, MA (T.N.).
5. Department of Neuroradiology, University Hospital Basel, Switzerland (M.P.).
6. Alexandria Faculty of Medicine, Department of Neurology, Alexandria University, Egypt (O.M.).
7. Neuroscience Center, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia (F.A.-A.).
8. Department of Neurovascular Center, Naval Medical University Changhai Hospital, Shanghai, China (P.Y.).
9. Department of Neurology, Christian Medical College and Hospital, Vellore, India (J.P.).
10. Division of Interventional Radiology, Department of Diagnostic Imaging, National University Health System, Singapore (A. Gopinathan).
11. Department of Neurology, Oslo University Hospital, Ullevål, Norway (E.C.S.).
12. Oxford University Hospital NHS Foundation Trust, Oxford, United Kingdom (J.K.).
13. Department of Radiology, Dalhousie University, Halifax, Canada (D.V.).
14. Division Neurology, Department of Medicine, The Ottawa Hospital, Ottawa Hospital Research Institute, University of Ottawa, Ontario, Canada (R.F.).
15. Department of Neurological Surgery, Thomas Jefferson University Hospital, Philadelphia, PA (S.T.).
16. Department of Neuroradiology, The Royal London Hospital, Barts NHS Trust, United Kingdom (P.B.).
17. Department of Neurology, Stavanger University Hospital, Norway (M.K.).
18. Department of Neurology, University of Miami Miller School of Medicine, FL (D.Y.).
19. Department of Neurology, University of Tennessee Health Science Center, Memphis (V.I.).