[1] Umea Univ, Dept Surg & Perioperat Sci Urol & Androl, S-90185 Umea, Sweden
[2] Churchill Hosp, Dept Radiol, Oxford OX3 7LJ, England
[3] Lister Hosp, Dept Urol, Stevenage, Herts, England
[4] Charles Univ Hosp, Plzen, Czech Republic
[5] Hannover Med Sch, Dept Urol & Urol Oncol, D-3000 Hannover, Germany
[6] Univ Paris 11, Dept Urol, Bicetre Hosp, Paris, France
[7] Radboud Univ Nijmegen, Dept Urol, Med Ctr, NL-6525 ED Nijmegen, Netherlands
[8] Fundeni Clin Inst, Dept Urol & Kidney Transplantat, Bucharest, Romania