1 Department of Neurology (D.A.C., A.S.L-C., S.J.P., A.G., A.Z., E.P.F.), Department of Laboratory Medicine and Pathology (S.J.P., E.P.F.), Department of Medicine, Divisions of Cardiology (B.A.B.), Department of Hematology (W.J.H., Y.L.), Department of Gastroenterology (J.J.P.), and Mayo Medical School (K.M.W.), Mayo Clinic, Rochester, MN.