1. Department of Cardiothoracic Surgery, Heart and Vascular Centre, Maastricht University Medical Centre, Maastricht, the Netherlands
2. Department of Medicine and Surgery, Circolo Hospital, University of Insubria, Varese, Italy
3. Clinical Department of Cardiac Surgery, Central Clinical Hospital of the Ministry of Interior in Warsaw, Warsaw, Poland
4. Cardiothoracic Surgery Department, San Raffaele University Hospital, Milan, Italy
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. Department of Experimental and Clinical Medicine, “Magna Graecia” University of Catanzaro, Catanzaro, Italy
8. Department of Cardiovascular Anesthesia and Intensive Care, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Policlinico San Donato, San Donato Milanese, Italy
9. Department of Cardio-Thoracic Surgery, University Hospital Henri-Mondor, Assistance Publique–Hopitaux de Paris Créteil, Paris, France
10. Department of Cardiac Surgery, Medical University of Innsbruck, Innsbruck, Austria
11. Cardiac Surgery Unit, Cardio-Thoraco-Vascular Department, Niguarda Hospital, Milan, Italy
12. Cardiothoracic Department, University Hospital of Udine, Udine, Italy
13. Cardiac Surgery Unit, IRCCS Policlinico San Donato, San Donato Milanese, Italy
14. Section of Cardiac Surgery, University Hospital, Pisa, Italy
15. Department of Cardiac Surgery, Cardiovascular Center, Klinikum Nürnberg, Paracelsus Medical University, Nuremberg, Germany
16. Cardiac Surgery Unit, Poliambulanza Foundation Hospital, Brescia, Italy
17. Cardiac Surgery Department, Mauriziano Hospital, Turin, Italy
18. Cardiovascular and Thoracic Surgery Department, King Fahad Medical City, Riyadh, Saudi Arabia
19. Cardiac Surgery Unit, Luigi Sacco Hospital, Milan, Italy
20. Department of Cardiac Surgery, Medical University of Silesia, School of Medicine in Katowice, Katowice, Poland
21. Department of Cardiac Surgery, Upper-Silesian Heart Center, Katowice, Poland
22. Department of Thoracic and Cardiovascular Surgery, West-German Heart Center, University of Duisburg-Essen, Essen, Germany
23. Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
24. Department of Cardiac Surgery, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
25. Department of Cardiothoracic Surgery, Golden Jubilee National Hospital, Glasgow, Scotland
26. Department of Cardiac Surgery, Louis Pradel Cardiologic Hospital, Lyon, France
27. Department of Cardiovascular Surgery, University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
28. Cardiovascular and Transplant Department, Papa Giovanni XXIII Hospital, Bergamo, Italy
29. Department of Cardiovascular Surgery, University Heart & Vascular Center Hamburg, Hamburg, Germany
30. Cardiovascular Research Institute Maastricht, Maastricht, the Netherlands