1. Department of Obstetrics and Gynecology; VU University Medical Center; Amsterdam The Netherlands
2. Department of Obstetrics and Gynecology; Leiden University Medical Center; Leiden The Netherlands
3. Department of Pediatric Cardiology; Leiden University Medical Center; Leiden The Netherlands
4. Department of Obstetrics and Gynecology; Academic Medical Center; Amsterdam The Netherlands
5. Department of Pediatric Cardiology; VU University Medical Center; Amsterdam The Netherlands
6. Department of Epidemiology and Biostatistics; VU University Medical Center; Amsterdam The Netherlands
7. Department of Obstetrics and Gynecology; University Medical Center, University of Groningen; Groningen The Netherlands
8. Department of Pediatric Cardiology; Academic Medical Center; Amsterdam The Netherlands