1. University Medical Center and Duke Clinical Research Institute, Duke University, Durham, North Carolina
2. Heart Function Clinic, Division of Cardiology, University of Alberta, Edmonton, Alberta, Canada
3. Canadian VIGOUR Centre, Katz Group Centre for Pharmacy and Health Research, University of Alberta, Edmonton, Alberta, Canada
4. Department of Cardiology, University of Brescia, Brescia, Italy
5. Inova Heart and Vascular Institute, Fairfax, Virginia
6. Division of Cardiology, Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania
7. Section of Cardiovascular Medicine, Yale University School of Medicine, New Haven, Connecticut
8. Department of Cardiology, University of North Carolina School of Medicine, Chapel Hill
9. Division of Cardiology, Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
10. Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, Maryland
11. Baim Institute for Clinical Research, Cardiology Division, Massachusetts General Hospital, Boston