1. Department of Biomedical Sciences, Section of Hygiene, University of Bari, Apulia Regional Epidemiological Observatory, Bari, Italy
2. Post-degree school in Hygiene and Preventive Medicine, University of Bari, Apulia Regional Epidemiological Observatory, Bari, Italy
3. Department of Medical Sciences, Section of Hygiene, University of Foggia, Apulia Regional Epidemiological Observatory, Foggia, Italy