1. Department of Pediatric Hematology Emma Children's HospitalAmsterdam UMCUniversity of Amsterdam Amsterdam the Netherlands
2. Department of Pediatrics Medical University of Vienna Vienna Austria
3. Department of Oncology Center for Bleeding Disorders Careggi University Hospital Florence Italy
4. Van Creveldkliniek University Medical Center Utrecht Utrecht the Netherlands
5. Department of Hematology Maastricht University Medical Center Maastricht the Netherlands
6. Department of Hematology Erasmus University Medical Centre Rotterdam the Netherlands
7. Department of Cardiovascular Sciences Hemophilia Center University of LeuvenUniversity Hospitals Leuven Leuven Belgium
8. Angelo Bianchi Bonomi Hemophilia and Thrombosis Center Fondazione IRCCS Ca' GrandaOspedale Maggiore Policlinico Milan Italy
9. Department of Hematology Umberto I University Hospital Rome Italy
10. Department of Hematology Manchester Royal InfirmaryManchester University Manchester UK
11. Haemophilia Centre‐Haemostasis Unit Aghia Sophia Children's Hospital Athens Greece
12. Department of Clinical Epidemiology Leiden University Medical Center Leiden the Netherlands
13. Center for Clinical Transfusion Research Sanquin Research Leiden the Netherlands
14. Department of Molecular Cellular Hemostasis Sanquin Research and Landsteiner Laboratory Amsterdam the Netherlands
15. The Royal London Haemophilia Centre QMUL Barts and the London School of Medicine and Dentistry London UK