[1] Tech Univ Munich, Dept Urol, Klinikum Rechts Isar, Munich, Germany
[2] Univ Duisburg Essen, Dept Urol, Essen, Germany
[3] Heinrich Heine Univ, Dept Urol, Dusseldorf, Germany
[4] Cologne Univ, Cologne, Germany
[5] Klinikum Kassel, Dept Urol, Kassel, Germany
[6] Paracelsus Klin Golzheim, Dept Urol, Dusseldorf, Germany
[7] Staedt Klinikum Karlsruhe, Dept Urol, Karlsruhe, Germany
[8] Univ Hosp Ulm, Dept Urol, Ulm, Germany
[9] Klinikum Fulda, Dept Urol, Fulda, Germany
[10] Saarland Univ Hosp, Homburg, Germany
[11] Eberhard Karls Univ Tubingen, Univ Hosp Tuebingen, Dept Urol, Tubingen, Germany
[12] Klinikum Ludwigshafen, Dept Urol, Ludwigshafen, Germany
[13] Univ Magdeburg, Dept Urol, Magdeburg, Germany
[14] Staedt Kliniken Dortmund, Dept Urol, Dortmund, Germany
[15] Univ Witten Herdecke, Dept Urol, Wuppertal, Germany
[16] Krankenhaus Holweide, Kliniken Stadt Koeln, Dept Urol, Cologne, Germany