1. Gynecology and Obstetrics Service, Complejo Hospitalario Universitario Insular Materno-Infantil de Canarias (Mother and Child University Hospital of the Canary Islands), Las Palmas de Gran Canaria, Spain
2. General and Digestive Surgery Service, Complejo Hospitalario Universitario Insular Materno-Infantil de Canarias (Mother and Child University Hospital of the Canary Islands), Las Palmas de Gran Canaria, Spain