1. From the McAllister Heart Institute (R.-H.Z., A.E.V., I.T., X.-L.N., K.C.M., M.R., G.A.S., N.R.M., M.S.R.), Division of Cardiology (R.-H.Z., G.A.S., M.S.R.), Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC; Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC (J.D.C., H.T.).