[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] Hannover Med Sch MHH, Dept Urol & Urol Oncol, Hannover, Germany
[7] Univ Barcelona, Hosp Clin, Dept Urol, Barcelona, Spain
[8] Karolinska Univ Hosp, Dept Urol, Stockholm, Sweden
[9] Radboud Univ Nijmegen, Dept Urol, Med Ctr, NL-6525 ED Nijmegen, Netherlands