1. Department of Experimental, Diagnostic and Specialty Medicine, Alma Mater Studiorum, University of Bologna, Bologna, I-40138, Italy
2. Department of Medical Oncology, S. Maria della Misericordia Hospital, Perugia, I-06156, Italy
3. Department of Thoracic Surgery, University of Perugia, Perugia, I-06156, Italy
4. Institute of Pathological Anatomy and Histology, University of Perugia, Perugia, I-06156, Italy