From the Departments of Laboratory Medicine and Pathology (Y.J., J.P.F., V.A.L., A.M.L.Q., A.M., R.I., S.J.P.), Neurology (V.A.L., A.M., C.C., B.G.W., C.F.L., S.J.P.), Immunology (V.A.L.), and Health Sciences Research (S.M.J., C.Y.S.), College of Medicine, Mayo Clinic, Rochester, MN; Department of Neurology (D.M.W.), College of Medicine, Mayo Clinic, Scottsdale, AZ; and Department of Neurology (E.A.S.), College of Medicine, Mayo Clinic, Jacksonville, FL. (At 2013-10)