1. Oslo University Hospital Rikshospitalet Unger‐Vetlesens Institute Lovisenberg Diaconal Hospital, and University of Oslo Oslo Norway
2. Oslo University Hospital Rikshospitalet and University of Oslo Oslo Norway
3. Oslo University Hospital Rikshospitalet Oslo Norway
4. Children and Youth Rheumatology Association Oslo Norway
5. Lovisenberg Diaconal Hospital and University of Oslo Oslo Norway