1. From the Department of Neurology (C.D., E.F., V.R., W.J.J.) and Imaging of Dementia and Aging (IDeA) Laboratory (C.D., E.F., V.R., W.J.J.), Center for Neuroscience, and the Division of Biostatistics (D.H.), Department of Epidemiology and Preventive Medicine, University of California at Davis, Davis, Calif.