1. Department of Cardiothoracic Surgery, Heart and Vascular Centre, Maastricht University Medical Centre, Maastricht, Netherlands
2. Department of Medicine and Surgery, Circolo Hospital, University of Insubria, Varese, Italy
3. Cardiothoracic Surgery Department, San Raffaele University Hospital, Milan, Italy
4. Thoracic Research Centre, Collegium Medicum, Nicolaus Copernicus University, Innovative Medical Forum, Bydgoszcz, Poland
5. Department of Medicine and Surgery, Cardiac Surgery Clinic, San Gerardo Hospital, University of Milano-Bicocca, Monza, Italy
6. Department of Medicine and Surgery, University of Parma, Cardiac Surgery Unit, University Hospital of Parma, Parma, Italy
7. Cardiac Surgery Unit, Cardio-Thoraco-Vascular Department, Niguarda Hospital, Milan, Italy
8. Cardiothoracic Department, University Hospital of Udine, Udine, Italy
9. Section of Cardiac Surgery, University Hospital, Pisa, Italy
10. Department of Cardiac Surgery, Cardiovascular Center, Klinikum Nürnberg, Paracelsus Medical University, Nuremberg, Germany
11. Cardiac Surgery Unit, Poliambulanza Foundation Hospital, Brescia, Italy
12. Cardiac Surgery Department, Mauriziano Hospital, Turin, Italy
13. Cardiovascular and Thoracic Surgery Department, King Fahad Medical City, Riyadh, Saudi Arabia
14. Cardiac Surgery Unit, Luigi Sacco Hospital, Milan, Italy
15. Department of Cardiovascular Surgery, Ziekenhuis Oost-Limburg, Genk, Belgium
16. Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center, University of Duisburg-Essen, Essen, Germany
17. Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
18. Department of Cardiac Surgery, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
19. Cardiovascular Department, Papa Giovanni XXIII Hospital, Bergamo, Italy
20. Department of Cardiac Surgery, Medical University of Silesia, Katowice, Poland
21. Cardiovascular Research Institute Maastricht, Maastricht, Netherlands