1. Van Creveldkliniek University Medical Center Utrecht Utrecht The Netherlands
2. Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
3. Department of Hematology Radboud University Medical Center Nijmegen The Netherlands
4. Hemophilia Treatment Center Nijmegen‐Eindhoven‐Maastricht Nijmegen The Netherlands
5. Department of Hematology Erasmus MC University Medical Center Rotterdam Rotterdam The Netherlands
6. Department of Internal Medicine Division of Thrombosis and Hemostasis Leiden University Medical Center Leiden The Netherlands
7. Department of Vascular Medicine Amsterdam University Medical Centers University of Amsterdam Amsterdam The Netherlands
8. Netherlands Haemophilia Patient Society (NVHP) Nijkerk The Netherlands
9. Center for Child Development Exercise and Physical Literacy University Children's Hospital University Medical Center Utrecht The Netherlands
10. Department of Pediatric Hematology Emma Children's Hospital Amsterdam UMC University of Amsterdam Amsterdam The Netherlands