1. Department of Obstetrics and Gynecology, Hospital Universitario Departamental de Nariño, San Juan de Pasto, Colombia
2. Medical School, Pontificia Universidad Javeriana, Bogota, Colombia
3. Medical School, Universidad Cooperativa de Colombia, San Juan de Pasto, Colombia
4. Department of Surgery, Hospital Universitario Departamental de Nariño, San Juan de Pasto, Colombia