1 Department of Occupational and Environmental Medicine Epidemiology and Hygiene, INAIL, Monte Porzio Catone, 00040 Rome, Italy.
2 Research Center for Public Health, University of Milano-Bicocca, 20126 Milan, Italy.
3 Asia Pacific Centre for Work Health and Safety, A World Health Organization Collaborating Centre in Occupational Health, University of South Australia, Adelaide, SA CA1-05, Australia.
4 Centre for Organizational Health & Development, A World Health Organization Collaborating Centre in Occupational Health, University of Nottingham, Nottingham NG7 2RD, UK.
5 Northern Kentucky University, Highland Heights, KY 41099, USA.