1. Department of Cardiothoracic Surgery and Transplantation Royal Papworth Hospital Cambridge UK
2. Division of Cardiothoracic Surgery Cooper University Hospital Camden New Jersey USA
3. Division of Cardiac and Thoracic Surgery, St Paul's Hospital University of British Columbia Vancouver British Columbia Canada
4. Providence Heart Valve Clinic Providence St Vincent's Hospital Portland Oregon USA
5. Department of Cardiothoracic, Transplantation and Vascular Surgery Medizinische Hochschule Hannover Hannover Germany
6. Department of Cardiothoracic Surgery Blackpool Victoria Hospital Blackpool UK
7. Department of Cardiac, Vascular and Thoracic Surgery St Mark's Hospital Salt Lake Utah USA
8. Department of Surgery, Division of Cardiac Surgery Sunnybrook Health Sciences Center North York Ontario Canada
9. Division of Cardiothoracic Surgery University of Nebraska Medical Center Omaha Nebraska USA
10. Department of Cardiovascular Surgery German Heart Center Munich Munich Bavaria Germany