1 Thoracic Surgery Unit, Catholic University of The Sacred Heart, Fondazione Policinico A. Gemelli, Largo F. Vito n 1, 00168, Rome, Italy. Electronic address: filippo_lococo@yahoo.it.
2 Thoracic Surgery Unit, Policlinico Vittorio Emanuele Hospital, Catania, Italy.
3 Thoracic Surgery Unit, San Camillo Forlanini Hospital, Rome, Italy.