1. Thoracic Surgery Unit, Department of Surgical Sciences, Santa Maria della Misericordia University Hospital, University of Perugia Medical School, Perugia, Italy.
2. Endocrine Surgery Unit, Department of Surgical Sciences, Santa Maria University Hospital, University of Perugia Medical School, Terni, Italy.
3. Department of Surgery, Policlinico Umberto I, Sapienza University of Rome, Roma, Italy.