1 Department of Neurology (K.J.N., M.A., S.P., G.C., B.L.F.), Program in Neurogenetics, David Geffen School of Medicine, University of California, Los Angeles; Department of Medical Genetics (L.E.P., J.E.B.), Vanderbilt University Medical Center, Nashville, TN; Department of Psychiatry and Biobehavioral Sciences (J.A.C., G.C.), University of California, Los Angeles, CA; Institute of Neurological Sciences (F.C., S.C.), Italian National Research Council, Mangone, Italy; Department of Neurology (A.B.N., M.D.G.), UCSF Memory and Aging Center, University of California, San Francisco; Sackler Faculty of Medicine (S.H.), Tel-Aviv University, Israel; Italian College of General Practitioners and Primary Care (D.I.), Department of Clinical and Experimental Medicine (A.L.), University of Messina, Italy; and the Department of Human Genetics (B.L.F.), David Geffen School of Medicine, University of California, Los Angeles.