1. Occupational Medicine, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
2. Hygiene and Public Health, Department of Medical, Surgical Sciences and Advanced Technologies “G.F. Ingrassia”, University of Catania, Italy
3. Otorhinolaryngology, Department of Medical, Surgical Sciences and Advanced Technologies “G.F. Ingrassia”, University of Catania, Italy
4. Occupational Medicine, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
5. Occupational Medicine, Department of the Environment, Security, Territory, Food and Health Sciences, University of Messina, Messina, Italy