1. Department of Cardiothoracic Surgery, Heart and Vascular Centre Maastricht University Medical Centre Maastricht The Netherlands
2. Department of Surgical and Morphological Sciences, Circolo Hospital University of Insubria Varese Italy
3. Unit of Cardiac Surgery, Department of Medicine and Surgery University of Parma, University Hospital of Parma Parma Italy
4. Department of Cardiac Surgery Central Clinical Hospital of the Ministry of Interior in Warsaw Warsaw Poland
5. Department of Cardiac Surgery Niguarda Hospital Milan Italy
6. Unit of Cardiac Surgery, Department of Cardio‐Thoracic and Vascular Niguarda Hospital Milan Italy