1. Department of Obstetrics and Gynecology; VU University Medical Center; Amsterdam The Netherlands
2. Department of Pediatric Cardiology; Emma Children's Hospital, Academic Medical Center; Amsterdam 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 Obstetrics and Gynecology; Leiden University Medical Center; Leiden The Netherlands