Obstetrics and Gynaecology Department, Puerta de Hierro University Hospital, Autonoma University - Madrid, University of Lausanne - Materno-Fetal and Obstetrics Research Unit, Obstetrics and Gynaecology Department, Puerta de Hierro University Hospital, Obstetrics and Gynaecology Department, 12 Octubre University Hospital, Service of Pharmacy, Lausanne University Hospital, Obstetrics and Gynaecology Department, Gregorio Marañon University Hospital, Obstetrics and Gynaecology Department, Puerta de Hierro University Hospital, Autonoma University and University of Lausanne - Materno-Fetal and Obstetrics Research Unit