1. Department of Paediatrics, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands;
2. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands;
3. Van Creveldkliniek, University Medical Center Utrecht, Utrecht, The Netherlands;
4. Gesundheit Nord, Klinikum Bremen Mitte, Prof.-Hess-Kinderklinik, Bremen, Germany;
5. Division of Haematology/Oncology, Hospital for Sick Children, Toronto, Canada;
6. Department of Haematology, Royal Hospital for Sick Children, Yorkhill, Glasgow, UK;
7. Service d’hématologie pédiatrique, Hôpital La Timone & Aix-Marseille Univ, Marseille, France;
8. Dr. v. Haunersches Kinderspital, University of Munich, Munich, Germany;
9. Hemophilia Center, Department of Haematology, Great Ormond Street Hospital for children, London, UK;
10. Department of Pediatrics, Clinic of Coagulation Disorders, Karolinska Hospital, Stockholm, Sweden;
11. St. Sophia Children’s Hospital, Haemophilia-Haemostasis Unit, Athens, Greece;
12. Unitat Hemofilia, Hospital Traumatologica, Hospital Vall d’Hebron, Barcelona, Spain;
13. Institut für Experimentelle Hämatologie und Transfusionsmedizin, Universitätsklinikum Bonn, Bonn, Germany;
14. Department of Paediatric Haematology, St. James's Hospital, Dublin, Ireland;
15. Hospital General Unidad de Hemofilia, Hospitales Universitarios Virgen del Rocio, Sevilla, Spain;
16. Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy;
17. Centre Régional de Traitement de l'Hémophilie et Autres Maladies Bicetre, Service Hématologique, Paris, France;
18. Department of Haematology, The Children’s Hospital, Birmingham, UK;
19. Department of Pediatrics, University Hospital of Aarhus at Skejby, Aarhus, Denmark;
20. Center for Clinical Transfusion Research, Sanquin Foundation, Leiden, The Netherlands;
21. Department of Pediatrics and Malmö Centre for Thrombosis and Haemostasis, Skånes Universitetssjukhus, Malmö, Sweden; and
22. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands