[1] Heidelberg Univ, Dept Urol, SLK Kliniken Heilbronn, D-77074 Heilbronn, Germany
[2] Univ Leipzig, Dept Urol, D-7010 Leipzig, Germany
[3] Univ Basel, Dept Urol, Basel, Switzerland
[4] Univ Berlin, Dept Urol, Berlin, Germany
[5] Klinikum Leverkusen, Dept Urol, Leverkusen, Germany
[6] Klinikum Worms, Dept Urol, Worms, Germany
[7] Univ Zurich, Dept Urol, CH-8006 Zurich, Switzerland
[8] Elisabethenkrankenhaus Linz, Dept Urol, Linz, Austria
[9] Univ Mannheim, Dept Urol, Mannheim, Germany
[10] Goethe Univ Frankfurt, Dept Urol, D-6000 Frankfurt, Germany
[11] Nord West Krankenhaus Frankfurt, Dept Urol, Frankfurt, Germany
[12] Leibniz Univ Hannover, Dept Urol, D-30167 Hannover, Germany
[13] Helios Kliniken, Dept Urol, Berlin, Germany
[14] St Josephshosp, Dept Urol, Krefeld, Germany
[15] Klinikum Kaiserslautern, Dept Urol, Kaiserslautern, Germany
[16] Univ Halle Wittenberg, Dept Urol, D-4010 Halle An Der Saale, Germany