1. Fetal Medicine Research Institute, King’s College Hospital, London, UK (M.D., A.N.V., A.C.M., A.S., A.C., K.H.N.).
2. Medway Maritime Hospital, Gillingham, UK (R.A.).
3. Hospital Clínico Universitario Virgen de la Arrixaca and Institute for Biomedical Research of Murcia, IMIB-Arrixaca, Spain (C.D.P.M.).
4. Homerton University Hospital, London, UK (S.C.).
5. Royal London Hospital, UK (E.G.).
6. Southend University Hospital, Westcliff-on-Sea, UK (M.S.).
7. North Middlesex University Hospital, London, UK (D.J.).
8. School of Health Sciences, Universidad Francisco de Vitoria, Madrid, Spain (M.d.M.G.).
9. Hospital Universitario de Torrejón, Madrid, Spain (M.d.M.G.).
10. University Hospital Brugmann, Université Libre de Bruxelles, Brussels, Belgium (J.C.J.).
11. Hospital Universitario La Paz, Madrid, Spain (J.L.B.).
12. Fetal Medicine Foundation, London, UK (K.M.).
13. University of Exeter, UK (D.W.).