1. Department of Thoracic Surgery, Policlinico Tor Vergata University, Rome, Italy
2. Respiratory Unit, Department of Experimental Medicine, Policlinico Tor Vergata University, Rome, Italy
3. Department of Thoracic Surgery, Health Science University, Sureyyapasa Training and Research Hospital Chest and Thoracic Disease, Maltepe Istanbul, Turkey
4. Department of Thoracic Surgery, University of Turin, Turin, Italy
5. Instituto Nacional de Enfermedades Respiratorias, Ciudad de México, Mexico
6. Department of Thoracic Surgery, Assaf Harofeh Medical Center, Zerifin, Israel
7. Department of Thoracic Surgery, University Hospital Careggi, Florence, Italy
8. Department of Thoracic Surgery, University Hospital Zurich, Zurich, Switzerland
9. Section of Biostatistics, Tor Vergata University, Rome, Italy