1. From the Department of Neurology (S.B., R.R.D., P.R., L.N.G.C., A.L.B.), Brigham and Women's Hospital; Department of Neurology (R.R.D., P.R., L.N.G.C.), Massachusetts General Hospital; and Harvard Medical School (S.B., R.R.D., P.R., L.N.G.C., A.L.B.), Boston, MA.