1. Department of Obstetrics and Prenatal Diagnosis Leiden University Medical Center Leiden The Netherlands
2. Department of Engineering Science, Institute of Biomedical Engineering University of Oxford Oxford UK
3. Department of Biomedical Data Sciences, Section Medical Statistics and Bioinformatics Leiden University Medical Center Leiden The Netherlands
4. Nuffield Department of Women's and Reproductive Health University of Oxford Oxford UK
5. Department of Pediatric Cardiology Leiden University Medical Center Leiden The Netherlands