1. Cardiac surgery unit, Department of Cardiothoracic Surgery, St Georges’ University Hospital NHS Foundation Trust , London, UK
2. Division of Thoracic Surgery, Puerta de Hierro University Hospital , Majadahonda, Spain
3. Division of Thoracic Surgery, St James’s University Hospital , Leeds, UK
4. Department of Thoracic Surgery, Universitatsspital , Zurich, Switzerland
5. Department of Medical and Surgical Sciences, University of Bologna Medical School , Bologna, Italy
6. Division of Thoracic Surgery unit, IRCCS Azienda Ospedaliero-Universitaria, University of Bologna Medical School , Bologna, Italy
7. Division of Thoracic Surgery, University Hospital Leuven , Leuven, Belgium
8. Division of Thoracic Surgery, Biruni University School of Medicine , Istanbul, Turkey
9. Division of Thoracic Surgery, Universita Vita e Salute San Raffaele , Milan, Italy
10. Cardiothoracic Department, Rouen University Hospital, Inserm U1096, UNIVRouen , Normandy, France
11. Division of Thoracic Surgery, University of Torino , Torino, Italy
12. Division of Cardiothoracic Surgery, James Cook University Hospital , Middlesbrough, UK