1. Integrated Cancer Registry of Catania-Messina-Siracusa-Enna, Azienda Ospedaliero Universitaria Policlinico Vittorio Emanuele, Catania, Italy;
2. Department of Medical, Surgical Sciences, and Advanced Technologies “G.F. Ingrassia”, Section of Hygiene and Public Health, University of Catania, Catania, Italy;
3. Provincial Health Authority of Catania, Catania, Italy;
4. Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy