1 Department of Obstetrics and Gynecology, Academic Medical Center, Amsterdam UMC, University of Amsterdam, and Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, The Netherlands.
2 Center for Prenatal Diagnosis and Human Genetics, Berlin, Germany.
3 Western Sydney University, Sydney, Australia.
4 Department of Obstetrics and Gynecology, University of Tuebingen, Tuebingen, Germany.
5 Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, UK.
6 Fetal Medicine Unit, St George's University of London, London, UK.
7 Department of Obstetrics and Gynaecology, Chinese University of Hong Kong, Hong Kong SAR, China.
8 Department of Obstetrics and Fetal Medicine, Paris Cité University, Assistance Publique-Hopitaux de Paris, Hopital Necker-Enfants Malades, Paris, France.
9 Fetal Medicine Research Institute, King's College Hospital, London, UK.