1 Department of Surgical Oncology, Thoracic Surgery Unit, Regina Elena National Cancer Institute - IFO, Rome, Italy. Electronic address: gio.leuzzi@yahoo.it.
2 Division of Medical Oncology, Azienda Ospedaliera Universitaria Integrata, Verona, Italy.
3 Department of Surgical Oncology, Thoracic Surgery Unit, Regina Elena National Cancer Institute - IFO, Rome, Italy.