1. Division of Gastroenterology; Ospedale di Acireale; Azienda Sanitaria Provinciale di Catania; Catania Italy
2. Division of Laboratory Medicine; Ospedale di Acireale; Azienda Sanitaria Provinciale di Catania; Catania Italy
3. Division of Infectious Diseases; Ospedale “Ferrarotto”; Catania Italy
4. Department of Clinical and Experimental Medicine; University of Catania; Catania Italy
5. Department of Biomedical and Biotechnological Sciences; University of Catania; Catania Italy
6. Ultrasuoni Diagnostic Medical Center; Catania Italy