1. Childhood Cancer Research Unit Department of Women's and Children's Health Karolinska Institutet Stockholm Sweden
2. Astrid Lindgren Children´s Hospital Karolinska University Hospital Stockholm Sweden
3. Division of Hematology Coagulation Unit Karolinska University Hospital Stockholm Sweden
4. Hemostasis and Thrombosis Unit Haemophilia Centre Aghia Sophia Children's Hospital Athens Greece
5. Center for Benign Haematology Thrombosis and Haemostasis Van Creveldkliniek University Medical Center Utrecht Utrecht University Utrecht The Netherlands
6. Birmingham Children's Hospital Birmingham UK
7. Department of Clinical Sciences Pediatrics, Lund University Lund Sweden
8. Department for Thrombosis and Hemostasis Skåne University Hospital Malmö Sweden