1. From the Department of Neurology (A.d.H.), University of Utah, Salt Lake City
2. Department of Neurology (M.M., M.G.L., S.C., G.A.), Stanford University, CA
3. Department of Neurology, University of Southern California, Los Angeles (M.A.K.-T.)
4. Department of Neurology, Massachusetts General Hospital, Boston (T.L.-M.)
5. Department of Radiology, Brown Medical School, RI (R.A.M.)
6. Department of Radiology (M.A.), University of Utah, Salt Lake City
7. Department of Neurology, University of Cincinnati, OH (J.B.).
8. Department of Radiology (M.P.M., J.J.H.), Stanford University, CA