1. Department of Paediatrics and Adolescent Medicine Aarhus University Hospital Aarhus Denmark
2. Department of Haematology Aarhus University Hospital Aarhus Denmark
3. Haematology‐Pathology Research Laboratory Department of Haematology Odense University Hospital Odense Denmark
4. Department of Paediatrics III University Children's Hospital Essen University of Duisburg‐Essen Essen Germany
5. Department of Pathology The Norwegian Radium Hospital Oslo Norway
6. Laboratory of Molecular Haematology and Pathology Turku University Central Hospital Turku Finland
7. Department of Paediatrics Institute of Clinical Sciences Sahlgrenska Academy at University of Gothenburg Gothenburg Sweden
8. Department of Clinical Chemistry and Transfusion Medicine Institute of Biomedicine Sahlgrenska Academy at University of Gothenburg Gothenburg Sweden
9. Children's Hospital University of Helsinki and Helsinki University Central Hospital Helsinki Finland
10. Department of Paediatrics and Adolescent Medicine Rigshospitalet University of Copenhagen Copenhagen Denmark
11. Division of Paediatric and Adolescent Medicine Oslo University Hospital Oslo Norway
12. Department of Clinical Chemistry Sahlgrenska University Hospital Gothenburg Sweden