1. Department of Paediatric and Adolescent Medicine Akershus University Hospital Lørenskog Norway
2. Paediatric Research Group Faculty of Health Sciences UiT‐The Arctic University of Norway Tromsø Norway
3. Faculty of Medicine University of Oslo Oslo Norway
4. Paediatric Department Ostfold Hospital Trust Fredrikstad Norway
5. Department of non‐communicable diseases Norwegian Institute of Public Health Oslo Norway
6. Department of Paediatrics and Adolescence Medicine University Hospital of North Norway Tromsø Norway