1. Harris Birthright Research Centre of Fetal Medicine King's College Hospital London UK
2. Department of Obstetrics and Gynecology Hospital Universitario de Torrejón, Torrejón de Ardoz Madrid Spain
3. School of Medicine Universidad Francisco de Vitoria, Pozuelo de Alarcón Madrid Spain
4. Department of Obstetrics and Gynecology University Hospital Brugmann Brussels Belgium
5. Department of Fetal Medicine Medway Maritime Hospital Gillingham UK
6. Institute of Medical Sciences Canterbury Christ Church University Chatham UK