1. From the Center for Molecular Imaging Research, Massachusetts General Hospital, Harvard Medical School, Charlestown (F.A.J., R.W.); Donald W. Reynolds Cardiovascular Clinical Research Center, Harvard Medical School, Boston, Mass (F.A.J., P.L., R.W.); Cardiovascular Division, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass (P.L.); and Cardiovascular Research Center and Cardiology Division, Department of Medicine, Massachusetts General Hospital, Harvard...