1. Department of Mental Health and Public Medicine; Second University of Naples; Naples Italy
2. Department of Tropical and Infectious Diseases; Policlinico Umberto Primo; Rome Italy
3. Department of Clinical Medicine and Surgery; Gastroenterology Unit; University of Naples “Federico II”; via Sergio Pansini; Naples Italy
4. Department of Medical Sciences; University of Turin; Turin Italy
5. Unit of Infectious Diseases; S. Anna and S. Sebastian Hospital; Caserta Italy
6. Department of Internal Medicine; San Pietro Hospital; Ponte San Pietro Italy
7. Clinic of Infectious Diseases; University of Sassari; Sassari Italy
8. Gastroenterology and Hepatology Unit; Di.Bi.MI.S. University of Palermo; Palermo Italy
9. Infectious Diseases; Department of Mental and Physical Health and Preventive Medicine; Second University of Naples; Caserta Italy
10. Gastroenterology Unit; Fondazione “Casa Sollievo della Sofferenza” IRCCS Hospital; San Giovanni Rotondo; Foggia Italy