1 Departments of Surgery (Urology) and Human Genetics, University of Utah School of Medicine, Salt Lake City, UT, USA.
2 Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy.
3 Sexual Medicine and Andrology Unit, Department of Clinical and Experimental Biosciences 'Mario Serio', University of Florence, Florence, Italy.
4 Department of Obstetrics and Gynecology, Center for Research on Reproduction and Women's Health, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.