1. From the Rush Alzheimer's Disease Center (S.O., F.G., A.M.E., B.D.J., A.W.C., Y.C., K.A., J.A.S., D.A.B.); Department of Neurological Sciences (S.O., A.W.C., J.A.S., D.A.B.); Department of Internal Medicine (F.G., B.D.J., Y.C.); Department of Diagnostic Radiology and Nuclear Medicine (A.M.E., K.A.), Rush University Medical Center; Department of Biomedical Engineering (K.A.), Illinois Institute of Technology; and Department of Pathology (J.A.S.), Rush University Medical Center, Chicago, IL.