1. Department of Obstetrics, Division of Fetal Medicine; Leiden University Medical Center; Leiden The Netherlands
2. PLATO, Center for Research and Development in Education and Training; Faculty of Social Sciences; Leiden The Netherlands
3. Department of Pediatrics, Division of Neonatology; Leiden University Medical Center; Leiden The Netherlands
4. Department of Obstetrics and Gynecology, Division of Fetal Medicine; University Hospitals KU Leuven; Leuven Belgium
5. Center for Fetal Medicine, Department of Obstetrics and Gynecology; Karolinska University Hospital; Stockholm Sweden