1. Department of Urology, Medical University of South Carolina, Charleston, South Carolina
2. Division of Pediatric Radiology, Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins Medical Institutions, Baltimore, Maryland
3. Department of Urology, San Antonio Military Medical Center, San Antonio, Texas
4. Department of Orthopaedic Surgery, The Johns Hopkins Medical Institutions, Baltimore, Maryland
5. Division of Pediatric Urology, Department of Urology, The Brady Urological Institute, The Johns Hopkins Medical Institutions, Baltimore, Maryland