1. Fetal Medicine Research InstituteKing's College Hospital London UK
2. Obstetrics and Gynecology DepartmentHospital Universitario de Torrejón, Torrejón de Ardoz Madrid Spain
3. School of Health Sciences, Universidad Francisco de VitoriaPozuelo de Alarcón Madrid Spain
4. Department of Fetal MedicineMedway Maritime Hospital Gillingham UK
5. Department of Obstetrics and GynecologyUniversity Hospital Brugmann, Université Libre de Bruxelles Brussels Belgium
6. Institute of Medical SciencesCanterbury Christ Church University Chatham UK
7. Department of Preventive Medicine and Public HealthHospital Príncipe de Asturias, Alcalá de Henares Madrid Spain
8. CIBER Epidemiology and Public Health (CIBERESP) Madrid Spain