1 Division of Thoracic Surgery, Sant'Andrea Hospital, Faculty of Medicine and Psychology, University of Rome "Sapienza", Via di Grottarossa 1035, 00189 Rome, Italy. Electronic address: claudioandreetti@libero.it.
2 Division of Thoracic Surgery, Sant'Andrea Hospital, Faculty of Medicine and Psychology, University of Rome "Sapienza", Via di Grottarossa 1035, 00189 Rome, Italy.
3 Division of Thoracic Surgery, "G. Mazzini" Hospital of Teramo, Faculty of Medicine and Surgery, University of L'Aquila, Piazza Italia 1, 64100 Teramo, Italy.
4 Division of Thoracic Surgery, Sant'Andrea Hospital, Faculty of Medicine and Psychology, University of Rome "Sapienza", Rome, Italy.