J A Lopez-Fernandez1, J Marcos-Sanmartín2, J C Martinez-Escoriza2. 1. Department of Obstetrics and Gynecology, Universitary General Hospital of Alicante, Miguel Hernandez University, Alicante, Spain. Electronic address: lopez_josfer@gva.es. 2. Department of Obstetrics and Gynecology, Universitary General Hospital of Alicante, Miguel Hernandez University, Alicante, Spain.