1. From the Department of Radiology, Mayo Clinic, Rochester, MN (S.F., D.D., S.W., R.K., D.F.K., W.B.)
2. Department of Physiology, CÚRAM–Centre for Research in Medical Devices, National University of Ireland Galway, Ireland (S.F., A.D., K.M.D.)
3. Department of Radiology, Baylor University Medical Center, Dallas, TX (K.F.L., I.C.T.)
4. Department of Radiology, New England Center for Stroke Research, University of Massachusetts Medical School, Worcester (M.J.G., J.-Y.C., A.S.P.)
5. Department of Radiology, Hotchkiss Brain Institute, University of Calgary, Alberta, Canada (M.A., A.M.D.)
6. Department of Radiology, Stroke and Cerebrovascular Surgery, Lyerly Neurosurgery/Baptist Neurological Institute, Jacksonville, FL (R.A.H., E.S., A.A.)
7. Department of Radiology, Texas Stroke Institute, Dallas–Fort Worth (A.J.Y.)
8. Department of Radiology, University of Tennessee Medical Center, Knoxville (P.K.)
9. Joint Department of Medical Imaging, Toronto Western Hospital, Ontario, Canada (V.M.P.)
10. Department of Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, MN (Y.K., J.E.D.A.)
11. Department of Radiology, Marcus Stroke and Neuroscience Center, Grady Memorial Hospital and Emory University, Atlanta, GA (R.G.N.)
12. Department of Neurology, Mayo Clinic, Rochester, MN (A.A.R.).