1. Department of Urology; University Hospital Erlangen; Erlangen Germany
2. German Cochrane Centre; Medical Centre; University of Freiburg; Freiburg Germany
3. UroEvidence; Deutsche Gesellschaft für Urologie e.V.; Düsseldorf Berlin Germany
4. Department of General and Visceral Surgery; Medical Centre; University of Freiburg; Freiburg Germany
5. Centre for Medical Biometry and Medical Informatics; Medical Centre; University of Freiburg; Freiburg Germany
6. Urology Section 112D; Department of Veterans Affairs; University of Minnesota; Minneapolis MN USA
7. Department of Urology; University of Minnesota; Minneapolis MN USA