1. Division of Occupational and Environmental Medicine, Lund University, 221 00 Lund, Sweden
2. Division of Public Health, Kristianstad University, 291 88 Kristianstad, Sweden
3. Department of Health Sciences, Faculty of Social Sciences, University of Tampere, 33014 Tampere, Finland
4. Fafo Institute for Labour and Social Research, 0608 Oslo, Norway
5. Department of People and Society, Swedish University of Agricultural Sciences, 230 53 Alnarp, Sweden
6. School of Health, Victoria University of Wellington, Easterfield Building, Kelburn Parade, Wellington 6140, New Zealand