1. Department of Health Sciences, University of Florence, Florence, Italy
2. Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
3. Department of Health Sciences, University of Genoa, Genoa, Italy
4. Department of Public Health, Clinical and Molecular Medicine, University of Cagliari, Cagliari, Italy
5. Regional Center for Disease Prevention and Control, Veneto Region, Venezia, Italy
6. Department of Science for Health Promotion and Mother to Child Care G. d'Alessandro, University of Palermo, Palermo, Italy
7. Ministry of Health, Rome, Italy