1. Department of Obstetrics and Prenatal Diagnosis Leiden University Medical Center Leiden The Netherlands
2. Institute of Biomedical Engineering Department of Engineering Science University of Oxford Oxford UK
3. Department of Biomedical Data Sciences Section Medical Statistics Leiden University Medical Center Leiden The Netherlands
4. Nuffield Department of Obstetrics and Gynecology John Radcliffe HospitalUniversity of Oxford Oxford UK
5. Department of Pediatric Cardiology Leiden University Medical Center Leiden The Netherlands