1. San Raffaele Vita-Salute University
2. Infectious Diseases Department, San Raffaele Scientific Institute, Milan
3. Unit of Infectious Diseases, ASST della Valle Olona, Busto Arsizio
4. Ente Ospedaliero Ospedali Galliera, Genova
5. Department of Medical Sciences and Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia
6. ASST Cremona, Cremona
7. Azienda Ospedale-Università Padova, Padova
8. Unit of Infectious Diseases, Department of Medical Sciences, University of Turin, Torino
9. Infectious and Tropical diseases Unit, Azienda Ospedaliero Universitaria Careggi, Florence
10. Department of Medical Biotechnologies, University of Siena, Siena, Italy.