1. Department of Obstetrics; Leiden University Medical Center; Leiden The Netherlands
2. Department of Pediatrics, Division of Neonatology; Leiden University Medical Center; Leiden The Netherlands
3. Center for Clinical Transfusion Research, Sanquin Research; Leiden The Netherlands
4. Department of Immunohematology and Blood Transfusion; Leiden University Medical Center; Leiden The Netherlands
5. Immunohematology Diagnostic Services, Sanquin Blood Supply; Amsterdam The Netherlands