1. Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
2. Royal Brompton Hospital, Royal Brompton and Harefield National Health Service Foundation Trust, Institute of Cardiovascular Medicine and Sciences, National Heart and Lung Institute, Imperial College London, London, United Kingdom
3. Department of Medicine, Baylor College of Medicine, Houston, Texas
4. Center for Chronic Disease Outcomes Research, Minneapolis Veterans Administration Hospital, University of Minnesota, Minneapolis