[1] IVI Bilbao, Androl Lab, Vizcaya, Spain
[2] UPV, Leioa, Spain
[3] UPV EHU Basque Country, Physiol, Leioa, Spain
[4] Univ Cordoba, Human Embryol & Anat Sci Dept, Cordoba, Spain
[5] Cruces Hosp, Obstet & Gynecol Unit, Baracaldo, Spain
[6] IVI Bilbao, Vizcaya, Spain
[7] IVI Bilbao, Reprod Unit, Vizcaya, Spain