1 Department of Neurology (P.S.N., M.V.P., C.J.K.), Department of Laboratory Genetics and Genomics (J.L.N., L.H., E.W.H.), Department of Anatomic Pathology (J.L.N., M.E.F.), and Department of Clinical Genomics (R.H.G.), Mayo Clinic and Mayo Foundation, Rochester, MN.