1. Department of Obstetrics and Fetal Medicine Leiden University Medical Center Leiden Netherlands
2. Department of Obstetrics and Gynecology Center for Fetal Medicine Karolinska University Hospital Stockholm Sweden
3. Department of Paediatric Cardiology Emma Children's Hospital Academic Medical Center Amsterdam UMC Amsterdam Netherlands
4. Department of Obstetrics Amsterdam Reproduction and Development Research Institute, Amsterdam University Medical Center Amsterdam Netherlands
5. Department of Paediatric Cardiology Leiden University Medical Center Leiden Netherlands
6. Department of Cardiothoracic Surgery Leiden University Medical Center Leiden The Netherlands