1 Shriners Hospitals for Children - Northern California, Sacramento, CA; Department of Urology, University of California Davis Medical Center, Sacramento, CA. Electronic address: rsturm@mednet.ucla.edu.
2 Shriners Hospitals for Children - Northern California, Sacramento, CA; Department of Urology, University of California Davis Medical Center, Sacramento, CA.
3 Division of Biostatistics, University of California Davis, Davis, CA.