1. Fetal Medicine Unit, Obstetrics and Gynecology Service, BioCruces Health Research Institute; Hospital Universitario Cruces. University of the Basque Country (UPV/EHU); Barakaldo Spain
2. Centro Gutenberg; Unidad Medicina Fetal; Málaga Spain
3. Prenatal Diagnosis Unit, Obstetrics and Gynecology Service; Hospital Universitario Donostia; San Sebastián Spain
4. Clinical Epidemiology Unit; Hospital Universitario Cruces, BioCruces Health Research Institute; Barakaldo Spain
5. Maternal-Fetal Medicine Unit, Department of Obstetrics and Gynecology; San Cecilio University hospital; Granada Spain
6. Fetal Medicine Unit; La Arrixaca University Hospital; Murcia Spain
7. CIBER de Epidemiología y Salud Pública (CIBERESP); Madrid Spain
8. Hospiten Group; Canary Islands Spain
9. Maternal-Fetal Medicine Unit, Department of Obstetrics and Gynecology; Vall d'Hebrón University Hospital; Barcelona Spain
10. Fetal Medicine Unit, Obstetrics, Gynecology and Reproductive Medicine Department; Institut Universitari Quirón-Dexeus; Barcelona Spain
11. Fetal Medicine Unit; Hospital Clínico Universitario Lozano Blesa; Zaragoza Spain
12. Fetal Medicine Unit; Hospital Son Llàtzer; Palma de Mallorca Spain