From the Department of Neurology (H.B., R.C.P., D.S.K., B.F.B.), Department of Clinical Genomic and Neurology (R.H.G.), Department of Psychiatry and Psychology (M.A.M., J.A.F.), Department of Nuclear Medicine (V.J.W.), Department of Radiology (C.R.J.), and Alzheimer's Disease Research Center (C.M.D., D.J.G.), Mayo Clinic, Rochester, MN; and Department of Neuroscience (N.A.F., R.R.), Mayo Clinic, Jacksonville, FL.