1. Department of Health Registry Research and Development Norwegian Institute of Public Health Bergen Norway
2. Department of Clinical Medicine University of Bergen Bergen Norway
3. Department of Pediatric and Adolescent Medicine Stavanger University Hospital Stavanger Norway
4. Department of Health Registries Norwegian Institute of Public Health Bergen Norway
5. Agency for Children and Families Bergen Norway
6. Department of Clinical Science University of Bergen Bergen Norway
7. Haukeland University Hospital Bergen Norway
8. Department of Public Health and Primary Care KU Leuven University of Leuven Leuven Belgium
9. Children and Youth Clinic Haukeland University Hospital Bergen Norway