1. Department of Van Creveldkliniek; University Medical Center Utrecht; Utrecht The Netherlands
2. Department of Haematology; Erasmus University Medical Center Rotterdam; Rotterdam The Netherlands
3. Department of Thrombosis and Haemostasis and Einthoven Laboratory for Experimental Vascular Medicine; Leiden University Medical Center; Leiden The Netherlands
4. Department of Pediatric Haematology; Erasmus University Medical Center-Sophia Children's Hospital; Rotterdam The Netherlands
5. Jon J van Rood Center for Clinical Transfusion Medicine, Sanquin Research; Leiden The Netherlands
6. Department of Clinical Epidemiology; Leiden University Medical Center; Leiden The Netherlands
7. Department of Pediatric Haematology; Academisch Medisch Centrum; Emma Children's Hospital; Amsterdam The Netherlands
8. Department of Haematology; Radboud University Medical Center; Nijmegen The Netherlands
9. Department of Haematology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands