1. Endocrine Surgical Unit, University of Perugia, Perugia;
2. Thoracic Surgical Unit, University of Perugia, Perugia;
3. General Surgical Unit, University of Perugia, Perugia;
4. Department of Internal Medicine, University of Perugia, Perugia;
5. Institute of Pathological Anatomy, University of Perugia, Perugia;
6. Oncology Unit, AOSP Terni, Italy