1. Department of Pediatric Cardiology of the Emma Children's Hospital; Academic Medical Centre; Amsterdam The Netherlands
2. The Centre for Congenital Heart Anomalies Amsterdam-Leiden (CAHAL); Amsterdam The Netherlands
3. Department of Obstetrics and Gynecology; Academic Medical Centre, Amsterdam; The Netherlands
4. Department of Obstetrics and Gynecology, University Medical Centre Groningen; University of Groningen; Groningen The Netherlands