1. Royal Free Hospital, Department of Urology, Renal Cancer Unit, London, UK
2. Barts Experimental Cancer Medicine Centre, Barts Cancer Institute, Queen Mary University of London, London, UK
3. Royal Free Hospital, Department of Medical Oncology, London, UK
4. Royal Free Hospital, Department of Urology, Renal Cancer Unit, University College London, Division of Surgical and Interventional Sciences, London, UK
5. The Netherlands Cancer Institute Division of Surgical Oncology, Department of Urology, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands