1. Section of Hygiene - Institute of Public Health, Università Cattolica del Sacro Cuore, Roma, Italy
2. Department of Experimental Medicine, University of Perugia, Perugia, Italy
3. Section of Occupational Medicine - Institute of Public Health, Università Cattolica del Sacro Cuore, Roma, Italy
4. Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italy
5. Istituto Superiore di Sanità, Roma, Italy