1. Van Creveldkliniek/Department of Hematology; University Medical Center Utrecht; Utrecht; The Netherlands
2. Department of Vascular Medicine; Academic Medical Center; Amsterdam; The Netherlands
3. Department of Pediatric Hematology; Emma Children's Hospital, Academic Medical Center; Amsterdam; The Netherlands
4. Department of Vascular Medicine and Haemostasis; University Hospital; Leuven; Belgium
5. Department of Hematology; Erasmus University Medical Center; Rotterdam; The Netherlands
6. Department of Hematology; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands
7. Department of Clinical Chemistry and Hematology; University Medical Center Utrecht; Utrecht; The Netherlands
8. Department of Experimental Vascular Medicine; Academic Medical Center; Amsterdam; The Netherlands