1. Department of Thoracic Surgery, Maggiore & Bellaria Teaching Hospitals, Bologna 40133, Italy
2. Department of Thoracic Surgery, AUSL Romagna Teaching Hospital, Ravenna 48121, Italy
3. Department of Thoracic Surgery, ASST Mantova, Mantova 46100, Italy
4. Department of Thoracic Surgery, IRCCS ISMETT-UPMC, University of Pittsburgh, Palermo 90127, Italy
5. Department of Thoracic Surgery, University Hospital Careggi, Firenze 50134, Italy
6. Thoracic Surgery, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, University of Milan, Milan 20122, Italy
7. Section of Thoracic Surgery, Department of Surgery, Policlinico University Hospital, Catania 95125, Italy
8. Department of Thoracic Surgery, University of L'Aquila, L'Aquila 67100, Italy