1. University Medical Center Utrecht, Wilhelmina Children’s Hospital, Department of Obstetrics, Utrecht, The Netherlands
2. University Medical Center Groningen, Department of Obstetrics and Gynaecology, University of Groningen, Groningen, The Netherlands
3. University Medical Center Utrecht, Department of Cardiology, Utrecht, The Netherlands; University Medical Centre Utrecht, Center for Transla- tional Immunology, Utrecht, The Netherlands
4. Amsterdam University Medical Centers, Department of Obstetrics, University of Amsterdam, Amsterdam, The Netherlands
5. Erasmus MC University Medical Center Rotterdam, Department of Obstetrics and Fetal Medicine, Rotterdam, The Netherlands
6. University Medical Center Utrecht, Department of Cardiology, Utrecht, The Netherlands