1. Aarhus University Hospital Aarhus Denmark
2. University Hospital of North Norway and UiT – The Arctic University of Norway Tromsø Norway
3. NTNU – Norwegian University of Science and Technology and Levanger HospitalNord‐Trøndelag Hospital Trust Levanger Norway
4. Uppsala University, Uppsala, Sweden, and Ryhov County Hospital Jonkoping Sweden
5. Hospital for Children and AdolescentsUniversity of Helsinki Helsinki Finland
6. NTNU – Norwegian University of Science and Technology and St. Olavs Hospital Trondheim Norway
7. Rigshospitalet Copenhagen University Hospital Copenhagen Denmark
8. Institute of Clinical SciencesSahlgrenska AcademyUniversity of Gothenburg Gothenburg Sweden
9. Uppsala University Uppsala Sweden