1. Department of Dermatology, University College London Hospitals NHS Foundation Trust, London, UK
2. Department of Urology and Institute of Andrology, University College London Hospitals NHS Foundation Trust, London, UK
3. Division of Surgery and Interventional Science, University College London, London, UK
4. Division of Urology, Department of Surgery, School of Clinical Medicine, The University of Hong Kong, Hong Kong
5. Division of Urology, Queen Mary Hospital, Hong Kong, China
6. Department of Histopathology, University College London Hospitals NHS Foundation Trust, London, UK