1. Department of Urology University of Ulm Ulm Germany
2. Department of Urology Rechts der Isar Medical Centre Technical University of Munich Munich Germany
3. Faculty of Medicine University of Toronto Toronto ON Canada
4. University of Minnesota Medical School Minneapolis MN USA
5. Department of Urology Emory University Atlanta GA USA
6. Yonsei Wonju Medical Library Yonsei University Wonju College of Medicine Wonju South Korea
7. Urology Section Minneapolis VA Health Care System Minneapolis MN USA
8. Department of Urology University of Minnesota Minneapolis MN USA