1. Department of Obstetrics and Gynaecology, CEMIC University Hospital, City of Buenos Aires, Argentina
2. Department of Obstetrics and Gynaecology, Fernández Hospital, City of Buenos Aires, Argentina
3. Department of Obstetrics and Gynaecology, Hospital Interzonal Dr. José Penna, Bahía Blanca, Argentina
4. CYMSA Clínica y Maternidad Suizo Argentina, Buenos Aires, Argentina