1. Pediatric Hematology; Academic Medical Center; Amsterdam the Netherlands
2. Department of Medicine I; Medizinische Universität Wien; Vienna Austria
3. Karolinska University Hospital; Stockholm Sweden
4. Radboud University Nijmegen Medical Center; Nijmegen the Netherlands
5. Erasmus University Medical Center; Rotterdam the Netherlands
6. Sapienza University of Rome; Rome Italy
7. University Hospital la Fe; Valencia Spain
8. Hematology Department; University Medical Center Groningen; Groningen the Netherlands
9. Department of Clinical Epidemiology; Leiden University Medical Center; Leiden the Netherlands
10. Department of Plasma Proteins; Sanquin Research; Amsterdam the Netherlands