[1] Ludwig Maximilians Univ Munchen, Dept Urol, Campus Grosshadern,Marchioninistr 15, D-81377 Munich, Germany
[2] Johannes Gutenberg Univ Mainz, Dept Urol, Univ Med Ctr, Mainz, Germany
[3] Univ Hosp Frankfurt, Dept Urol & Pediat Urol, Frankfurt, Germany
[4] St Bernward Hosp Hildesheim, Dept Urol, Hildesheim, Germany
[5] Univ Hosp Bonn, Dept Urol & Pediat Urol, Bonn, Germany
[6] Asklepios Hosp West Hamburg, Dept Urol, Hamburg, Germany
[7] Helios Hosp Duisburg, Dept Urol & Pediat Urol, Duisburg, Germany
[8] Hosp Lueneburg, Dept Urol, Luneburg, Germany
[9] Hosp Gottlicher Heiland Vienna, Dept Urol, Vienna, Austria
[10] Hosp Weinviertel Korneuburg, Dept Urol, Korneuburg, Austria
[11] St Barbara Hosp Hamm GmbH, Dept & Pediat Urol, Hamm, Germany
[12] Evangel Hosp Bielefeld, Dept Urol, Bielefeld, Germany
[13] Univ Hosp Muenster, Dept Urol, Munster, Germany
[14] Univ Hosp Schleswig Holstein, Dept Urol & Pediat Urol, Campus Kiel, Kiel, Germany
[15] Diakonie Hosp Stuttgart, Dept Urol, Stuttgart, Germany
[16] Diakonie Hosp Schwabisch Hall, Dept Urol, Schwabisch Hall, Germany
[17] Univ Hosp Bern, Dept Urol, Bern, Switzerland