Affiliation: | 1. Human Reproduction Unit, Department of Obstetrics and Gynecology, Ciudad Sanitaria “Enrique Sotomayor” University of Bilbao School of Medicine, Cruces-Bilbao, Spain;2. Human Reproduction Unit, Department of Pathology, Ciudad Sanitaria “Enrique Sotomayor” University of Bilbao School of Medicine, Cruces-Bilbao, Spain |