1. Department of Obstetrics, Leiden University Medical Center, Leiden, the Netherlands
2. Jon J van Rood Center for Clinical Transfusion Research, Sanquin-Leiden University Medical Center, Leiden, the Netherlands
3. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
4. Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, the Netherlands
5. Department of Obstetrics and Gynecology, Deventer Hospital, Deventer, the Netherlands
6. Athena Institute, Vrije Universiteit, Amsterdam, the Netherlands
7. Division of Thrombosis and Hemostasis, Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
8. Sanquin Blood Bank, Unit Transfusion Medicine, Leiden, the Netherlands
9. Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
10. Department of Anesthesiology, Albert Schweitzer Hospital, Dordrecht, the Netherlands
11. Department of Obstetrics, Birth Center Wilhelmina’s Children Hospital, Division Woman and Baby, University Medical Centre Utrecht, Utrecht, the Netherlands