1. From the Department of Urology (PA) and Department of Biostatistics (RF), Bonn University, Bonn, Departments of Urology, Krankenhaus am Urban, Berlin (LW), Essen University, Essen (SK), Münster University, Münster (SK), Military Hospital, Hamburg (MH), Marburg University, Marburg (AH), Kreiskrankenhaus Lüdenscheid (PW), Hannover University, Hannover (MK), and Klinikum Kassel, Kassel (PA), Germany