1. Integrated Cancer Registry of Catania-Messina-Siracusa-Enna, Azienda Universitario Ospedaliera Policlinico “Vittorio Emanuale”, Catania, Italy;
2. Hepato-Gastroenterology Division, Second University of Naples, Napoli, Italy;
3. Human Nutrition Unit, Department of Food Science, University of Parma, Parma, Italy