[1] Univ Cambridge, Addenbrookes Hosp, Dept Surg, Cambridge Biomed Campus, Cambridge, England
[2] Natl Canc Res Inst, Bladder & Renal Canc Clin Studies Grp, London, England
[3] Royal Berkshire Hosp, Harold Hopkins Dept Urol, Reading, Berks, England
[4] Univ Sheffield, Weston Pk Hosp, Acad Unit Clin Oncol, Sheffield, S Yorkshire, England
[5] Univ Sheffield, Weston Pk Hosp, Canc Clin Trials Unit, Sheffield, S Yorkshire, England