1. From the Department of Neurology (H.E., J.L., H.M., E.S.V., G.K., O.C.M., A.G.F., N.P., M.D., S.D., N.N., A.Q., C.H., A.Z.L., A.D., K.C.F., P.A.C., E.S.S., S.S.), Johns Hopkins University School of Medicine; Department of Electrical and Computer Engineering (J.L.P.), Johns Hopkins University, Baltimore, MD; and Mellen Center for Multiple Sclerosis (R.B.), Cleveland Clinic, OH.