1. Department of Neurology (G.W.A., M.G.L.), Stanford University, CA.
2. Department of Radiology (J.J.H.), Stanford University, CA.
3. Division of Cerebrovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan (M.I.).
4. Cerebral Vascular Disease Department, Beijing Anzhen Hospital, Capital Medical University, China (X.H.).
5. Department of Neurology, Johns Hopkins University, Baltimore, MD (V.S.Y.).
6. Neurology Department, Hôpital Fondation A. de Rothschild, Paris, France (P.S.).
7. Department of Neurology, University of Minnesota, Minneapolis (M.M.C.-H.).
8. Neurocenter of Southern Switzerland, EOC, Lugano, Switzerland (C.W.C.).
9. Cerebrovascular Center and Department of Neurology, Cleveland Clinic, OH (J.P.T.).
10. Department of Neurology, University of Cincinnati, OH (E.A.M., P.K.).
11. Department of Radiology, Washington University School of Medicine, Saint Louis, MO (A.R.C.).
12. Department of Radiology and Medical Imaging, University of Virginia School of Medicine, Charlottesville (C.P.D.).
13. Neurology Department, CHU Toulouse, France (J.M.O.).
14. Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Canada (M.D.H.).
15. Department of Neurology, University of California Los Angeles (J.L.S.).
16. Department of Neurology, Beth Israel Deaconess Medical Center & Harvard Medical School, Boston, MA (M.F.).