1. Department of Urologic Surgery and Duke Prostate Center Duke University Medical Center Durham North Carolina USA
2. Urology Department Assiut University Assiut Egypt
3. Department of Urology University of Florida Health Jacksonville Florida USA
4. Department of Urology Penn State Health Milton S. Hershey Medical Center Hershey Pennsylvania USA
5. Duke Cancer Institute and Department of Statistics Durham North Carolina USA
6. Inova Health System Falls Church Virginia USA