Department of Medical and Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, 95123 Catania, Italy. stefano.marventano@studium.unict.it. Department of Clinical Medicine and Surgery, "Federico II" University, 80131 Naples, Italy. c.vetrani@libero.it. Department of Clinical Medicine and Surgery, "Federico II" University, 80131 Naples, Italy. marilena.vitale@unina.it. Integrated Cancer Registry of Catania-Messina-Siracusa-Enna, Azienda Ospedaliero-Universitaria Policlinico Vittorio Emanuele, 95124 Catania, Italy. justyna.godos@student.uj.edu.pl. Department of Clinical Medicine and Surgery, "Federico II" University, 80131 Naples, Italy. riccardi@unina.it. Integrated Cancer Registry of Catania-Messina-Siracusa-Enna, Azienda Ospedaliero-Universitaria Policlinico Vittorio Emanuele, 95124 Catania, Italy. giuseppe.grosso@studium.unict.it.