1. Department of Life, Health and Environmental Sciences, Thoracic Surgery Unit, University of L’Aquila, 67100 L’Aquila, Italy
2. Department of Thoracic Surgery, Cuneo General Hospital, 12100 Cuneo, Italy
3. Thoracic Surgery Department of Experimental and Clinical Medicine, University of Florence, 50121 Florence, Italy
4. Division of Thoracic Surgery, University Hospital of Pisa, 56124 Pisa, Italy
5. Division of Thoracic Surgery and Lung Transplantation, IRCCS ISMETT-UPMC, 90127 Palermo, Italy