1. From Imaging of Dementia and Aging (IDeA) Laboratory (D.Y.L., E.F., O.M., N.Z., J.K., J.T., O.C., C.D.), Department of Neurology and Center for Neuroscience, University of California at Davis, Davis, Calif; Department of Neuropsychiatry (D.Y.L.), School of Medicine, Seoul National University, Seoul, Korea; Department of Radiology (M.B.), University of California at Davis, Davis, Calif.