1. Department of Obstetrics and Gynecology Hospital Universitario Fundación Santa Fe de Bogotá Bogotá Colombia
2. Medical School, Universidad de los Andes Bogotá Colombia
3. Department of Pathology Hospital Universitario Fundación Santa Fe de Bogotá Bogotá Colombia
4. Department of Obstetrics and Gynecology Clínica Universidad de Navarra Pamplona Spain