1 Van Creveldkliniek, Division of Internal Medicine and Dermatology, University Medical Center Utrecht, Utrecht University, the Netherlands.
2 Department of Hematology, Rigshospitalet, Copenhagen University Hospital, University of Copenhagen, Denmark.
3 Central Diagnostic Laboratory - Research, Division of Laboratories, Pharmacy and Biomedical Genetics, University Medical Center Utrecht, Utrecht University, the Netherlands.
4 Division of Laboratories, Pharmacy and Biomedical Genetics, Department of Clinical Pharmacology, University Medical Center Utrecht, Utrecht University, the Netherlands.
5 Department of Clinical Medicine, University of Copenhagen, Denmark.
6 Pediatric Hematology, Van Creveldkliniek, University Medical Center Utrecht, Utrecht University, the Netherlands.