[1] Univ Tubingen, Dept Urol, D-72076 Tubingen, Germany
[2] Churchill Hosp, Dept Radiol, Oxford OX3 7LJ, England
[3] Kaiser Franz Josef Spital, Dept Med 3, Vienna, Austria
[4] Kaiser Franz Josef Spital, ACR ITR CEADDP, Vienna, Austria
[5] Kaiser Franz Josef Spital, LBI ACR Vienna CTO, Vienna, Austria
[6] Univ Clin, Urol Clin, Aachen, Germany
[7] Hannover Med Sch MHH, Dept Urol & Urol Oncol, Hannover, Germany
[8] Univ Barcelona, Dept Urol, Hosp Clin, Barcelona, Spain
[9] Karolinska Univ Hosp, Dept Urol, Stockholm, Sweden
[10] Radboud Univ Nijmegen, Med Ctr, Dept Urol, NL-6525 ED Nijmegen, Netherlands