1. Department of Thoracic Surgery, Ospedale del Mare, ASL Napoli1 Centro , Naples, Italy
2. Department of Thoracic Surgery, Azienda Ospedaliera S Maria della Misericordia , Perugia, Italy
3. University Federico II of Naples , Naples, Italy
4. Thoracic Surgery Unit, Azienda Ospedaliera Santa Maria , Terni, Italy