1. Department of Health Sciences, University of Florence, Florence, Italy
2. Specialization Medical School of Hygiene and Preventive Medicine, University of Florence, Florence, Italy
3. Department of Experimental and Clinical Medicine, University of Florence, Italy and Infectious and Tropical Diseases Unit, Careggi University Hospital, Florence, Italy
4. Operative Unit of Hygiene and Public Health, Local Health Unit of Florence, Regional Health Service, Florence, Italy
5. Tuscany Region, Rights of Citizenship and Social Cohesion, Florence, Italy
6. Health Direction, Careggi University Hospital, Florence, Italy