1. Rigshospitalet, Copenhagen, Denmark
2. University of Copenhagen, Copenhagen, Denmark
3. Aarhus University Hospital, Aarhus, Denmark
4. Herlev University Hospital, Herlev, Denmark
5. Odense University Hospital, Odense, Denmark
6. Uppsala University Hospital, Uppsala, Sweden
7. Karolinska University Hospital, Stockholm, Sweden
8. Queen Silvia Children's Hospital, Gothenburg, Sweden
9. Umeå University, Umeå, Sweden
10. Skåne University Hospital, Lund, Sweden
11. Trondheim University Hospital, Trondheim, Norway
12. Oslo University Hospital, Oslo, Norway
13. University of Oslo, Oslo, Norway
14. Vilnius University Hospital Santaros Klinikos, Vilnius, Lithuania
15. Vilnius University, Vilnius, Lithuania
16. Helsinki University Hospital, Helsinki, Finland
17. Tallinn Children’s Hospital, Tallinn, Estonia
18. Tartu University Hospital, Tartu, Estonia
19. Reykjavik University Hospital, Reykjavík, Iceland