1. Department of Mental Health and Public Medicine, Section of Infectious Diseases, Second University of Naples, Naples, Italy
2. Department of Infectious Diseases, D. Cotugno Hospital, AORN Dei Colli, Naples, Italy
3. Microbiology and Virology Unit, Monaldi Hospital, Naples, Italy
4. Infectious Diseases Section, Department of Medicine, University of Perugia, Perugia, Italy