1. From the Department of Neurology (E.A.M., S.W.E.), Mayo Clinic, Jacksonville, FL; Department of Neurology (E.A.C., J.K.C.-G., J.M.M.-T., L.K.J.), Mayo Clinic, Rochester, MN; and Department of Neurology (E.D.D.-D., M.F.G.), Mayo Clinic, Scottsdale, AZ.