1 Department of Health Science, Section of Hygiene, Preventive Medicine and Public Health, University of Florence, Florence, Italy.
2 Regional Health Agency of Tuscany, Florence, Italy.
3 Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.
4 Regional Health Agency of Tuscany, Florence, Italy; Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy. Electronic address: [email protected].