1. Section of Occupational Medicine, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, I-60126 Ancona, Italy
2. Department of Specialistic Clinical and Odontostomatological Sciences, Polytechnic University of Marche, I-60131 Ancona, Italy
3. Section of Hematology, Department of Clinical and Molecular Science, Polytechnic University of Marche, I-60126 Ancona, Italy
4. Section of Occupational Medicine, Department of Clinical and Experimental Medicine, University of Catania, I-95124 Catania, Italy