1. From the Heart and Vascular Institute (T.M.F., M.T., J.M.), Department of Emergency Medicine (R.N., M.H., S.N., K.R.F.), Department of Internal Medicine (K.L.E., M.A., S.V., M.R., A.M.), and Biostatistics Division, Department of Public Health Sciences (G.J.), Henry Ford Hospital, Detroit, MI.