1. Department of Urology; Medical University of Vienna; Vienna Austria
2. Department of Urology; University of Turin; Turin Italy
3. Centre for Medical Statistics, Informatics and Intelligent Systems; Medical University of Vienna; Vienna Austria
4. Department of Urology; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
5. Department of Urology; University of Texas Southwestern Medical Center; Dallas TX USA
6. Department of Urology; Weill Cornell Medical College; New York NY USA