1. Infectious Diseases Unit, PROMISE University Hospital of Palermo Palermo Italy
2. Chronic Viral Illness Service McGill University Health Centre Montreal Canada
3. University of Modena and Reggio Emilia Modena Italy
4. Clinical and Experimental Medicine PhD Program University of Modena and Reggio Emilia Modena Italy
5. Clinical Epidemiology and Cancer Register Unit University Hospital of Palermo Palermo Italy
6. Service of Gastroenterology and Hepatology, PROMISE University Hospital of Palermo Palermo Italy
7. Infectious Diseases Unit University Hospital of Modena Modena Italy