1. Department of Paediatric and Adolescent Medicine; Akershus University Hospital; Lørenskog Norway
2. Akershus Faculty Division; University of Oslo; Lørenskog Norway
3. Institute of Clinical Medicine; Campus Akershus University Hospital; University of Oslo; Oslo Norway
4. HØKH; Research Centre; Akershus University Hospital; Lørenskog Norway
5. Department of Paediatrics; University Hospital of North Norway; Tromsø Norway
6. Paediatric Research Group; Faculty of Health Sciences; University of Tromsø; Tromsø Norway