1 Department of Maternal-Infant and Urological Sciences, "Sapienza" University of Rome, Policlinico Umberto I Hospital, Rome, Italy; Department of Urology, Stanford University School of Medicine, Stanford, CA.
2 Department of Urology, Stanford University School of Medicine, Stanford, CA.
3 Department of Urology, Stanford University School of Medicine, Stanford, CA; Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA.