1. Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden
2. Centre for Research & Development, Uppsala University/County Council of Gävleborg, Gävle, Sweden
3. Department of Occupational and Environmental Medicine, Uppsala University Hospital, Sweden
4. Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, Gävle, Sweden