1. Fetal Medicine Service, Obstetrics, Gynecology and Reproductive Medicine Department; Institut Universitari Quirón-Dexeus; Barcelona Spain
2. Statistical. Fetal Medicine Service, Obstetrics, Gynecology and Reproductive Medicine Department; Institut Universitari Quirón-Dexeus; Barcelona Spain
3. Pathological Department in Hospital de Sant Joan de Déu; Esplugues de Llobregat; Barcelona Spain