1. Department of Paediatrics Division of Neonatology Leiden University Medical Centre Leiden the Netherlands
2. Centre for Clinical Transfusion Research Sanquin Leiden the Netherlands
3. Department of Obstetrics Division of Foetal Medicine Leiden University Medical Centre Leiden the Netherlands
4. Department of Immunohaematology and Blood Transfusion Leiden University Medical Centre Leiden the Netherlands
5. Department of Immunohematology Diagnostics Sanquin Amsterdam the Netherlands