1. Department of Dermatology; University Hospital; Coventry West Midlands UK
2. Department of Dermatology; Chelsea and Westminster Hospital; London UK
3. Department of Dermatology; University College Hospital; London UK
4. Department of Dermatology; University of Toronto, Faculty of Medicine; Toronto Canada
5. Department of Pathology; Charing Cross Hospital; London UK
6. Department of Urology; Charing Cross Hospital; London UK
7. Department of Urology; University College Hospital; London UK
8. Department of HIV/GUM ; Chelsea and Westminster Hospital; London UK
9. Department of Urology; Chelsea and Westminster Hospital; London UK