1. Quebec Heart & Lung Institute, Laval University, Quebec City, Quebec, Canada
2. Emory University Hospital, Atlanta, Georgia
3. Centre Hospitalier Régional et Universitaire de Brest, Brest, France
4. University of Pittsburgh Medical Center, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Cedars Sinai Heart Institute, Los Angeles, California
6. University of Pennsylvania Medical Center, Philadelphia
7. Bern University Hospital, Bern, Switzerland
8. Mayo Clinic, Rochester, Minnesota
9. St Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada
10. Hospital Clínico San Carlos-Madrid, Madrid, Spain
11. Hospital Clinico Universitario de Valladolid, Valladolid, Spain
12. Hospital Virgen de la Victoria, Malaga, Spain
13. Hospital Universitari Vall d'Hebron, Barcelona, Spain
14. Washington University in St Louis School of Medicine, St Louis, Missouri
15. Cleveland Clinic, Cleveland, Ohio