1. Department of Infectious Diseases; “Niguarda Cà Granda” Hospital; Milan Italy
2. Direzione Medica di Presidio; AO “A. Manzoni”; Lecco Italy
3. Section of Microbiology, Department of Molecular Biology; University of Siena; Siena Italy
4. Division of Infectious Diseases; “Giovanni XXIII” Hospital; Bergamo Italy
5. Clinic of Infectious Diseases, Department of Biomedical and Clinical Sciences “Luigi Sacco”; University of Milan; Milan Italy