1. Infectious Diseases Unit; Siena University Hospital; Siena Italy
2. Department of Medical Biotechnologies; University of Siena; Siena Italy
3. Institute of Clinical Infectious Diseases; Catholic University of the Sacred Heart; Rome Italy
4. Department of Experimental and Clinical Medicine; University of Florence; Florence Italy
5. Department of Mathematics; University of Roma Tre; Rome Italy
6. Unit of Microbiology and Virology; Modena University Hospital; Modena Italy
7. Hygiene Unit; Policlinico San Martino Hospital; Genoa Italy
8. Department of Infectious Diseases; S. Maria Nuova IRCCS Hospital; Reggio Emilia Italy
9. Molecular Virology Unit; Microbiology and Virology Department; IRCCS San Matteo Hospital Foundation; Pavia Italy
10. Infectious Diseases Clinic; Perugia University Hospital; Perugia Italy
11. Department of Infectious Diseases; Galliera Hospital; Genoa Italy
12. Clinic of Infectious Diseases; ‘Guglielmo da Saliceto' Hospital; Piacenza Italy
13. Infectious Diseases Clinic; Policlinico San Martino Hospital; Genoa Italy