1. From the Department of Neurology (B.M.G., S.Y.), The Warren Alpert Medical School of Brown University, Providence, RI
2. The Warren Alpert Medical School of Brown University, Providence, RI (D.C.).
3. Department of Neurosurgery (C.D.), The Warren Alpert Medical School of Brown University, Providence, RI
4. Department of Diagnostic Imaging (M.V.J.), The Warren Alpert Medical School of Brown University, Providence, RI