1. Infectious and Tropical Diseases Unit; Careggi University Hospital; Florence Italy
2. Infectious Diseases Clinic, Department of Experimental & Clinical Medicine; University of Florence; Florence Italy
3. Department of Health Sciences; University of Florence; Florence Italy
4. Health Services Research Unit, Department of Experimental & Clinical Medicine; University of Florence; Florence Italy
5. Microbiology & Virology Unit; Careggi University Hospital; Florence Italy