1. Sapienza University of Rome 1 Department of Anatomy, Histology, Forensic Medicine and Orthopedic, Section of Histology , , Rome 00161 , Italy
2. Centre of Reproductive Medicine and Andrology, University Hospital Münster 2 , Münster 48149 , Germany
3. Sapienza University of Rome 3 Department of Cardiovascular, Respiratory, Nephrological, Anesthesiological and Geriatric Sciences , , Rome 00161 , Italy
4. Sapienza University of Rome 4 Department of Urology , , Rome 00185 , Italy