1. Department of Pediatrics Division of Neonatology Leiden University Medical CentreLeiden the Netherlands
2. Centre for Clinical Transfusion Research Sanquin ResearchLeiden the Netherlands
3. Department of Obstetrics and Gynecology Leiden University Medical Centre Leidenthe Netherlands
4. Department of Immunohematology Diagnostics SanquinAmsterdam the Netherlands
5. Department of Obstetrics and Gynaecology Amsterdam University Medical CentreAmsterdam the Netherlands
6. Department of Experimental Immunohematology Sanquin Amsterdamthe Netherlands
7. Department of Hematology Leiden University Medical Centre Leiden the Netherlands