1. Fetal Medicine Unit, Obstetrics Service, Department of Obstetrics, Gynecology and Reproductive Medicine University Hospital Quirón Dexeus Barcelona Spain
2. Fetal Medicine Research Institute King's College Hospital London UK
3. Department of Women and Children's Health Faculty of Life Sciences and Medicine, King's College London London UK
4. Epidemiological Unit, Department of Obstetrics, Gynecology and Reproductive Medicine University Hospital Quiron Dexeus Barcelona Spain