1. Department of Biomedical and Clinical Sciences, Università degli Studi di Milano, Italy
2. III Division of Infectious Diseases, ASST Fatebenefratelli Sacco, Luigi Sacco Hospital, Milan, Italy
3. Laboratorio di Prevenzione, ATS Insubria, Varese, Italy
4. Clinical Microbiology, Virology and Bioemergency Diagnostics, ASST Fatebenefratelli Sacco, Luigi Sacco Hospital, Milan, Italy
5. Opera San Francesco per i Poveri, Milan, Italy