1. Department of Clinical Sciences and Paediatrics Lund University Lund Sweden
2. Centre for Thrombosis and Haemostasis Skåne University Hospital Lund Sweden
3. Department for Paediatric Haematology and Oncology Skåne University Hospital Lund Sweden
4. Department of Pediatrics, Pediatric Hemato‐Oncology University Hospitals Leuven Leuven Belgium
5. Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy
6. Klinikum Bremen‐Mitte Professor‐Hess Children Hospital Bremen Germany
7. Van Creveld Kliniek University Medical Center Utrecht Utrecht The Netherlands
8. Division of Pediatric Hematology and Oncology, Department of Pediatrics Inselspital, University Hospital, University of Bern Bern Switzerland
9. Division of Pediatric Hematology, Oncology, and Stem Cell Transplantation, New Children's Hospital Helsinki University Hospital Helsinki Finland
10. Department of Pediatric Oncology and Hematology University Hospital Aarhus Denmark