1 Cardio-Thoracic Surgery Unit, Heart and Vascular Centre, Maastricht University Medical Centre (MUMC), Cardiovascular Research Institute Maastricht (CARIM), Maastricht, The Netherlands.
2 Department of Cardiovascular Disease, "Pierangeli" Hospital, Pescara, Italy.
3 Department of Cardiac Surgery, Gemelli Molise, Campobasso, Italy.