1. S. Orsola-Malpighi Hospital, Clinic of Infectious Diseases, ‘Alma Mater Studiorum’ University of Bologna, Bologna, Italy;
2. Infectious Diseases Unit, S. Maria Nuova Hospital, Reggio Emilia, Italy;
3. Infectious Diseases Unit, G.B. Rossi University Hospital, Verona, Italy;
4. Infectious Diseases and Hepatology Unit, Maggiore University Hospital, Parma, Italy;
5. Unit of Microbiology, ‘Alma Mater Studiorum’ University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy