1. Division of Surgery and Interventional Science (SR), University College London, London, United Kingdom
2. Surgical and Interventional Trials Unit (RS, NW, CB-G), University College London, London, United Kingdom
3. Department of Urology, University College London Hospital (WST, PK, JDK), London, United Kingdom
4. University College London Cancer Institute (SR, AF), London, United Kingdom
5. Department of Urology, Royal Surrey County Hospital (HM), Guildford, United Kingdom