1. Section for Psychosomatics and CL-Child Psychiatry, Department of Clinical Neurosciences for Children, Division of Paediatric and Adolescent Medicine; Oslo University Hospital; Oslo Norway
2. Department of Paediatrics, Institute of Clinical Medicine, Faculty of Medicine; University of Oslo; Oslo Norway
3. Norwegian Centre for Violence and Traumatic Stress Studies; Oslo Norway
4. Institute of Clinical Medicine, Faculty of Medicine; University of Oslo; Oslo Norway
5. Research and Communication Unit for Musculoskeletal Disorders; Oslo University Hospital; Oslo Norway
6. Department of Research and Development, Division of Mental Health and Addiction; Oslo University Hospital; Oslo Norway
7. Department of Behavioral Sciences in Medicine, Institute of Basic Medical Sciences, Faculty of Medicine; University of Oslo; Oslo Norway
8. Centre for Child and Adolescent Mental Health; Eastern and Southern Norway; Oslo Norway