1. Department of Medicine, Division of Cardiology (M.A., W.S.P., J.W.M.), Johns Hopkins University, Baltimore, MD.
2. Department of Biomedical Engineering (M.A., A.B.), Johns Hopkins University, Baltimore, MD.
3. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (G.Q., N.C.).
4. Department of Medicine, Division of Cardiology, Harvard Medical School, Boston, MA (D.L.B.).
5. National Institute for Prevention and Cardiovascular Health, National University of Ireland Galway School of Medicine (J.W.M.).