Affiliation: | a Cardiovascular Division, Brigham and Women's Hospital, Boston, MA b VA Boston Healthcare System, Boston, MA c Cardiovascular Medicine, Duke University Medical Center, Durham, NC d Duke Clinical Research Institute; Durham, NC e Baylor Heart and Vascular Institute, Baylor University Medical Center, Dallas, TX f Ahmanson-UCLA Cardiomyopathy Center, University of California, Los Angeles, CA |