1. From the Departments of Psychiatry and Behavioral Sciences (J.A.B., A.S., M.A.B., L.W., J.J., J.T.W.), Pharmacology (C.K.), and Medicine (P.-H.L., M.F.), Duke University Medical Center, Durham, NC; Department of Psychology (L.C.), Emory University, Atlanta, Ga; Department of Medicine (A.H.), University of North Carolina at Chapel Hill, Chapel Hill, NC.