Occupational Medicine, Department of Clinical and Experimental Medicine, University of Catania, 95123 Catania, Italy. Department of Sciences for Health Promotion and Mother and Child Care "Giuseppe D'Alessandro", University of Palermo, 90127 Palermo, Italy. Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Via Santa Sofia 100, 95123 Catania, Italy. Health Management of the "Cannizzaro" Emergency Hospital of Catania, 95126 Catania, Italy. Department of Prevention, Food Hygiene Service, Nutritional Surveillance and Prevention, Provincial Health Authority of Catania, 95027 San Gregorio di Catania, Italy. Occupational Medicine, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, 60126 Ancona, Italy.