1. From the Center for Social Epidemiology and Population Health (N.R., A.V.D.-R.), School of Public Health, University of Michigan; Department of Biostatistics (L.C.), University of North Carolina at Chapel Hill; Division of Epidemiology (D.J.), School of Public Health, University of Minnesota; Department of Population Health Sciences (F.J.N.), University of Wisconsin, Madison; Bloomberg School of Public Health (M.S.), Johns Hopkins University, Baltimore, Md.