1. Division of Cardiology Department of Medicine Mount Auburn Hospital, Cambridge, Massachusetts Harvard Medical School Boston Massachusetts USA
2. Heart and vascular center Dartmouth‐Hitchcock medical center Geisel school of medicine at Dartmouth College HanoverNew Hampshire USA
3. Department of Medicine Rutgers New Jersey Medical School Newark New Jersey USA
4. Imperial Vascular Unit Imperial College Healthcare NHS Trust London UK
5. National Heart and Lung Institute Imperial College London UK
6. Division of Pulmonary and Critical Care Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
7. Section of Cardiovascular Medicine Department of Medicine Yale School of Medicine New Haven Connecticut USA
8. Electrophysiology Section Division of Cardiology Hospital of the University of Pennsylvania Philadelphia Pennsylvania USA