1. From the Department of Neurology, UMass Medical School, Worcester, MA (N.H., E.L., M.M.); Department of Neurology, University of Miami, Jackson Memorial Hospital, Miami, FL (D.C.H.); Department of Neurology, Boston Children’s Hospital, Boston, MA (L.L.L.); Department of Radiology, UMass Memorial Medical Center, Worcester, MA (D.T.); Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA (M.S.).