1. Department of Clinical Chemistry and Laboratory Medicine Leiden University Medical Center Leiden the Netherlands
2. Department of Paediatric Haematology Sophia Children's Hospital, Erasmus University Medical Center Rotterdam the Netherlands
3. Department of Transfusion Medicine Sanquin Amsterdam the Netherlands
4. Department of Pediatrics, Division of Neonatology Leiden University Medical Center Leiden the Netherlands
5. Department of Immunohematology Diagnostics Sanquin Diagnostic Services Amsterdam the Netherlands
6. Department of Hematology Leiden University Medical Center Leiden the Netherlands