[1] Herlev Hosp, Dept Urol, DK-2730 Herlev, Denmark
[2] Frimley Pk Hosp NHS Fdn Trust, Frimley, Surrey, England
[3] Taunton & Somerset NHS Trust, Dept Urol, Taunton, Somerset, England
[4] PAN Klin Koln, Cologne, Germany
[5] Univ Hosp Freiburg, Dept Urol, Freiburg, Germany
[6] City Hosp Sunderland, Sunderland, England
[7] Univ Clin Lubeck, Lubeck, Germany
[8] Sheffield Teaching Hosp NHS Fdn Trust, Sheffield, S Yorkshire, England
[9] Inst San Rafaele, Div Urol, Milan, Italy
[10] Univ Munich, Dept Urol, D-81377 Munich, Germany