1. Cochrane Haematology, Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany
2. Institute of Medical Statistics and Computational Biology; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany
3. Population Health Sciences, Bristol Medical School; University of Bristol; Bristol UK
4. Department of Urology; University of Ulm; Ulm Germany
5. Urology Section; Minneapolis VA Health Care System; Minneapolis Minnesota USA
6. Department of Urology, Uro-oncology, Special Urological and Robot-assisted Surgery; University Hospital of Cologne; Cologne Germany