[1] Univ Hosp Basel, Urol Univ Clin Basel Liestal, Spitalstr 21, CH-4056 Basel, Switzerland
[2] Charite, Dept Urol, Charitepl 1, D-10117 Berlin, Germany
[3] Karolinska Univ Hosp, Karolinska Inst, Dept Mol Med & Surg MMK, S-17176 Stockholm, Sweden
[4] Vivantes Hosp Urban, Dept Urol, Dieffenbachstr 1, D-10967 Berlin, Germany
[5] Karolinska Univ Hosp, Dept Urol, S-17176 Stockholm, Sweden
[6] Hosp St Elisabeth, Dept Urol, Oberschwaben Clin, Elisabethenstr 15, D-88212 Ravensburg, Germany
[7] Franziskus Hosp Berlin, Dept Urol, Budapester Str 15-19, D-10787 Berlin, Germany