1. Thoracic Surgery Division, European Institute of Oncology, Milan, Italy
2. Division of Thoracic Surgery, Cisanello Hospital, Pisa, Italy
3. Division of Epidemiology and Biostatistics, European Institute of Oncology, Milan, Italy
4. Unit of Minimally Invasive Surgery, Division of General Surgery, European Institute of Oncology, Milan, Italy
5. Institute of Urology, University of Milan, Fondazione Ca’ Granda Policlinico, Mangiagalli, Regina Elena, Milan, Italy
6. University of Milan, Milan, Italy.