1. Gastroenterology Unit; IRCCS ‘Casa Sollievo Sofferenza’ Hospital; San Giovanni Rotondo (FG) Italy
2. Department of Medical Sciences University of Turin; Division of Gastroenterology and Hepatology; Città della Salute e della Scienza University Hospital; Turin Italy
3. Microbiology and Virology Unit; A.O. Città della Salute e della Scienza; Molinette Hospital; University of Turin; Turin Italy
4. Department of Mental Health and Public Medicine; Second University of Naples; Caserta Italy
5. Department for Gastroenterology, Hepatology and Endocrinology; Hannover Medical School; German Center for Infection Research; Hannover Germany
6. Department of Medicine and Research Laboratory of Internal Medicine; School of Medicine; University of Thessaly; Larissa Greece
7. Internal Medicine and Hepatology; Second University of Naples; Italy
8. Department of Clinical and Experimental Medicine; University of Foggia; Foggia Italy
9. IRCCS ‘Casa Sollievo Sofferenza’ Hospital; Blood Bank; San Giovanni Rotondo (FG); Italy
10. Department of Medical and Surgical Sciences; University of Bologna; Bologna Italy