1. EGA Institute for Women's Health Faculty of Population Health Sciences University College London London UK
2. Medical School University of Lisbon Santa Maria Hospital Lisbon Portugal
3. Department of Obstetrics, Rigshospitalet University of Copenhagen Copenhagen Denmark
4. Division of Maternal–Fetal Medicine Department of Obstetrics and Gynecology Baylor College of Medicine Houston TX USA
5. Nuffield Department of Women's and Reproductive Health University of Oxford Oxford UK
6. Fetal Medicine Unit John Radcliffe Hospital Oxford UK