From the Aging Research Center (C.S.D., A.M., D.R., R.W., J.S., W.X.), Department of Neurobiology, Care Sciences and Society, Karolinska Institutet and Stockholm University; Department of Clinical Neuroscience (J.S.), Psychology Division, Karolinska Institutet, Stockholm, Sweden; Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago; Rush Alzheimer's Disease Center (K.A., D.A.B.), and Department of Neurological Sciences (D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Epidemiology and Biostatistics (W.X.), School of Public Health, Tianjin Medical University, China.