1. Department of Obstetrics and Gynecology, Division of Fetal Medicine, Leiden University Medical Center, Leiden, The Netherlands
2. Department of Immunohematology Diagnostics, Sanquin,Amsterdam, The Netherlands
3. Willem-Alexander Children’s Hospital, department of Pediatrics, division of Neonatology, Leiden University Medical Center, Leiden, The Netherlands
4. Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, The Netherlands