1. National Heart, Lung, and Blood InstituteNational Institutes of Health Bethesda MD
2. Barts Heart CentreBarts Health NHS Trust London United Kingdom
3. University Hospital and University of Trieste Trieste Italy
4. University College London London United Kingdom
5. Department of Clinical Physiology Karolinska University Hospital, and Karolinska Institute Stockholm Sweden
6. UPMC Cardiovascular Magnetic Resonance CenterUPMC Pittsburgh PA
7. Department of Medicine University of Pittsburgh School of Medicine Pittsburgh PA
8. Heart and Vascular InstituteUPMC Pittsburgh PA
9. Clinical and Translational Science InstituteUniversity of Pittsburgh Pittsburgh PA
10. Minneapolis Heart InstituteAbbott Northwestern Hospital Minneapolis MN
11. Royal Free HospitalNHS Trust London United Kingdom
12. Kolling InstituteRoyal North Shore Hospital, and Charles Perkins CentreFaculty of Medicine and HealthUniversity of Sydney Sydney Australia
13. Minneapolis Heart Institute, United HospitalSt. Paul, Minnesota and Abbott Northwestern Hospital Minneapolis MN