1. Department of Mental Disorders, Division of Mental and Physical Health, Norwegian Institute of Public Health, Oslo, Norway
2. Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway in collaboration with Centre for Work and Mental Health, Nordland Hospital Trust, Bodø, Norway
3. School of Psychiatry, University of New South Wales, Sydney, New South Wales, Australia
4. Work Research Institute, Oslo and Akershus University College of Applied Sciences, Oslo, Norway