1. Centre for Clinical Transfusion Research Sanquin Leidenthe Netherlands
2. Department of Paediatrics Division of Neonatology Leiden University Medical Centre Leidenthe Netherlands
3. Department of Immunohaematology and Blood Transfusion Leiden University Medical Centre Leidenthe Netherlands
4. Department of Immunohaematology Diagnostics Sanquin Amsterdamthe Netherlands
5. Department of Clinical Epidemiology Leiden University Medical Centre Leidenthe Netherlands
6. Department of Obstetrics Division of Fetal Medicine Leiden University Medical Centre Leiden the Netherlands