1. Department of Clinical Science University of Bergen Bergen Norway
2. Department of Psychiatry University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA
3. Department of Psychosocial Science University of Bergen Bergen Norway
4. Department of Public Health and Primary Care, KU Leuven University of Leuven Leuven Belgium
5. Independent Researcher Stockholm Sweden
6. Department of Health and Functioning Western Norway University of Applied Sciences Bergen Norway
7. Department of Physiotherapy Haukeland University Hospital Bergen Norway
8. Department of Psychiatry Washington University School of Medicine St. Louis Missouri USA
9. Department of Clinical Psychology University of Bergen Bergen Norway
10. Children and Youth Clinic Haukeland University Hospital Bergen Norway
11. Department of Health Registry Research and Development Norwegian Institute of Public Health Bergen Norway