[1] Royal Surrey Cty Hosp NHS Fdn Trust, Dept Urol, Guildford GU2 7XX, Surrey, England
[2] UCL, Div Surg & Intervent Sci, London WC1E 6BT, England
[3] St Jamess Inst Oncol, Dept Med Phys, Leeds, W Yorkshire, England
[4] Complejo Hosp Univ, Dept Urol, La Coruna, Spain
[5] Prostate Canc Treatment Ctr Seattle, Seattle, WA USA
[6] Marien Krankenhaus, Dept Urol, Bergisch Gladbach, Germany
[7] Catalan Inst Oncol, Dept Radiat Oncol, Barcelona, Spain