1. From the Department of Neurology, New York University, Brooklyn (S.Y.)
2. Department of Neurology, The Warren Alpert Medical School of Brown University, Providence, RI (S.Y.)
3. Department of Neurology, University of Chicago, IL (S.P.)
4. Department of Neurology, University of Cincinnati, OH (P.K.)
5. Department of Neurology, Neurovascular Imaging Research Core and UCLA Stroke Center, University of California at Los Angeles (D.S.L.).