1. From the Department of Neurology (E.L.S., J.G.-R., M.M.M., D.S.K., R.C.P.), Mayo Clinic, Rochester, MN.
2. Department of Health Sciences Research, Division of Biomedical Statistics and Informatics (S.A.P., T.G.L.), Mayo Clinic, Rochester, MN.
3. Department of Epidemiology (M.M.M., R.C.P.), Mayo Clinic, Rochester, MN.
4. Department of Radiology (G.M.P., C.G.S., M.L.S., J.L.G., K.K., C.R.J., P.V.), Mayo Clinic, Rochester, MN.
5. Department of Psychology (M.M.), Mayo Clinic, Rochester, MN.