1. Fetal and Perinatal Medicine Research Group; Institut d'Investigacions Biomèdiques August Pi i Sunyer; University of Barcelona; Barcelona Spain
2. Department of Maternal-Fetal Medicine; Institut Clínic de Ginecologia, Obstetrícia i Neonatologia Hospital Clinic; Barcelona Spain
3. Centro de Investigación Biomédica en Red en Enfermedades Raras; Barcelona Spain