1. Faculty of Medicine, Institute of Clinical Medicine University of Oslo Oslo Norway
2. Department of Paediatric Neurology, Division of Paediatric and Adolescent Medicine Oslo University Hospital, Rikshospitalet Oslo Norway
3. Division of Orthopaedic Surgery Oslo University Hospital, Rikshospitalet Oslo Norway
4. Faculty of Medicine, Institute of Health and Society, Research Center of Habilitation and Rehabilitation Models and Services University of Oslo Oslo Norway
5. Department of Paediatric Neurology, Division of Paediatric and Adolescent Medicine Oslo University Hospital, Ullevål Oslo Norway
6. Department of Child and Adolescent Mental Health in Hospitals, Division of Paediatric and Adolescent Medicine Oslo University Hospital, Rikshospitalet Oslo Norway