1. Department of Occupational Medicine and Epidemiology, The National Institute of Occupational Health in Norway, Oslo, Norway
2. The Institute of Health and Society, University of Oslo, Oslo, Norway
3. Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
4. Institute of Clinical Medicine, Aarhus University, Aarhus, Denmark
5. Department of Physical Health and Ageing, The Norwegian Institute of Public Health, Oslo, Norway