1. Department of Occupational Medicine, Haukeland University Hospital, Bergen, Norway
2. Bjørgvin District Psychiatric Center, Haukeland University Hospital, Bergen, Norway
3. Department of Psychosocial Science, University of Bergen, Bergen, Norway
4. Center for Clinical Research, Haukeland University Hospital, Bergen, Norway
5. Faculty of Health and Social Sciences, Western Norway University of Applied Sciences, Bergen, Norway