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