1. Lung Cancer Unit, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
2. Department of Medical, Surgical and Experimental Sciences, University of Sassari, Italy
3. Medical Oncology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
4. Oncology Unit, Ospedale Maggiore della Carità, Novara, Italy