1 Università di Napoli "Federico II", Naples, Italy.
2 Golden Jubilee National Hospital, Glasgow, United Kingdom; University of Glasgow, Glasgow, United Kingdom.
3 Hôpital La Pitié Salpêtrière, Paris, France.
4 Cardiac Surgery, Centre Cardiologique du Nord de Saint-Denis (CCN), 36 Rue des Moulins Gémeaux, 93200 Saint-Denis, France. Electronic address: [email protected].