1. From the Departments of Neurology (S.B.S.-M., H.Z.-F., Y.G., N.T., J.J.C., A.Z., C.F.L., R.M., E.P.F.), Ophthalmology (J.J.C.), Internal Medicine (I.K.), and Oncology (J.J.O., M.S.B.), Mayo Clinic, Rochester, MN; and Neurology (C.F.L.), University of Texas at Austin.