1. Clinic of Infectious Diseases; IRCCS San Martino-IST, National Institute of Cancer; Genoa Italy
2. Clinic of Infectious Diseases; DIBIC “Luigi Sacco”, University of Milan; Milan Italy
3. Institute of Clinical Infectious Diseases; Catholic University of Sacred Heart; Rome Italy
4. Biostatistics Unit; Department of Health Sciences; University of Genoa; Genoa Italy
5. Hygiene Unit; IRCCS San Martino-IST; National Institute of Cancer; Genoa Italy
6. Clinic of Infectious Diseases; University of Bari; Bari Italy
7. Institute of Virology; AOU Careggi; Firenze Italy
8. Department of Infectious Diseases; EO Galliera; Genoa Italy
9. Department of Medical Biotechnologies; University of Siena; Siena Italy
10. University Division of Infectious Diseases; University Hospital of Siena; Siena Italy