1 The Catherine and Joseph Aresty Department of Urology, USC Institute of Urology, Keck School of Medicine, University of Southern California, Los Angeles, CA.
2 University Hospital of Caracas, Central University of Venezuela, Caracas, Venezuela.
3 The Catherine and Joseph Aresty Department of Urology, USC Institute of Urology, Keck School of Medicine, University of Southern California, Los Angeles, CA. Electronic address: rene.sotelo@med.usc.edu.