1. Department of Behavioural Medicine, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Blindern, Oslo, Norway
2. Department of Paediatric Haematology and Oncology, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Rikshospitalet, Nydalen, Oslo, Norway
3. Department of Interdisciplinary Health Sciences, Faculty of Medicine, University of Oslo, Blindern, Oslo, Norway
4. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Blindern, Oslo, Norway
5. Regional Centre for Child and Adolescent Mental Health Eastern and Southern Norway (RBUP), Nydalen, Oslo, Norway