1. Infectious Diseases Clinic, Department of Medicine (DAME), University of Udine, Udine, Italy
2. Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
3. Department of Biology, University of Pisa, Pisa, Italy
4. Unità Operativa di Elettrofisiologia, Studio e Terapia delle Aritmie, Monaldi Hospital, Naples, Italy
5. Microbiology and Virology Unit, Careggi University Hospital, Florence, Italy
6. Microbiology and Virology Unit, Azienda Ospedaliera dei Colli Hospital, Naples, Italy