1. Department of Paediatric Haematology and Oncology, Division of Paediatric and Adolescent Medicine Oslo University Hospital Oslo Norway
2. Department of Behavioural Medicine Institute of Basic Medical Science, Faculty of Medicine, University of Oslo Oslo Norway
3. Lovisenberg Diaconal University College Oslo Norway
4. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo Oslo Norway
5. Department of Paediatric Neurology, Division of Paediatric and Adolescent Medicine Oslo University Hospital Oslo Norway