1 Dipartimento di Scienze Cliniche e Bioimmagini, Università degli Studi G. d'Annunzio, Chieti-Pescara, Italy.
2 Cardio-Thoracic Surgery Department, Heart & Vascular Centre, Maastricht University Medical Centre, Maastricht, The Netherlands; Department of Cardiology, "Pierangeli" Hospital, Pescara, Italy.