1. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
2. Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, Gävle, Sweden
3. Occupational and Environmental Medicine, University of Gothenburg, Gothenburg, Sweden
4. School of Health Sciences, Jönköping University, Jönköping, Sweden