1. Department of Cardiology University of Groningen, University Medical Center Groningen Groningen The Netherlands
2. Department of Obstetrics University of Amsterdam, Amsterdam Universities Medical Centre, location Academic Medical Center Amsterdam The Netherlands
3. Department of Cardiology University of Amsterdam, Amsterdam Universities Medical Centre, location Academic Medical Center Amsterdam The Netherlands
4. Department of Cardiology University of Utrecht, University Medical Center Utrecht Utrecht The Netherlands
5. Department of Obstetrics University of Utrecht, University Medical Center Utrecht Utrecht The Netherlands
6. Department of Obstetrics University of Groningen, University Medical Center Groningen Groningen The Netherlands
7. Department of Epidemiology University of Groningen, University Medical Center Groningen Groningen The Netherlands
8. Department of Cardiology Radboud University, Radboud University Medical Center Nijmegen The Netherlands