Department of Medicine, Washington University in St Louis, St Louis, Missouri. Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts. Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, Ohio. Inova Heart and Vascular Institute, Falls Church, Virginia. Duke Clinical Research Institute, Duke University, Durham, North Carolina. Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia. Department of Medicine, Tufts Medical Center, Boston, Massachusetts. Department of Medicine, University of Washington, Seattle. Department of Medicine, Emory University, Atlanta, Georgia. Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota. Icahn School of Medicine at Mount Sinai, New York, New York. Department of Medicine, Massachusetts General Hospital, Boston. Department of Medicine, Duke University, Durham, North Carolina. Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Baltimore, Maryland.