1. Department of Hematology; Erasmus University Medical Center; Rotterdam The Netherlands
2. Department of Pediatric Hematology; Emma Children's Hospital, Academic Medical Center; Amsterdam The Netherlands
3. Van Creveldkliniek/Department of Benign Hematology; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Clinical Epidemiology; Leiden University Medical Center; Leiden The Netherlands
5. Jon J Van Rood Center for Clinical Transfusion Medicine, Sanquin Research; Leiden The Netherlands
6. Netherlands Hemophilia Society; Leiden The Netherlands
7. Department of Pediatric Hematology; Willem-Alexander Children's Hospital, Leiden University Medical Center; Leiden The Netherlands
8. Department of Pediatric Hematology; Maastricht University Medical Center; Maastricht The Netherlands
9. Department of Pediatric Hematology; Radboud University Medical Center; Nijmegen The Netherlands
10. Department of Pediatric Hematology; University Medical Center Groningen; Groningen The Netherlands
11. Department of Pediatric Hematology; Erasmus University Medical Center-Sophia Children's Hospital; Rotterdam The Netherlands