1. Department of Genitourinary Medicine, Royal Hallamshire Hospital, Glossop Road, Sheffield S10 2JF, UK
2. Peterborough District Hospital, PE3 6DA, UK
3. The Great Western Hospital, Swindon SN3 6BB, UK
4. Department of Primary Care and Population Sciences, Centre for Sexual Health of HIV Research, Mortimer Market Centre, London WCIE 6AU, UK
5. Medical Foundation for HIV and Sexual Health (MedFASH), UK
6. Health Protection Agency Division of Specialist and Reference Microbiology, 61 Collindale Avenue, London NW9 5HT, UK
7. Department of Genitourinary Medicine, Brighton & Sussex University, NHS Trust, UK
8. Ambrose King Centre, Royal London Hospital, London E1 1BB, UK
9. Rose Garden Medical Centre, Leith, Edinburgh EH6 6TL, UK
10. Terrence Higgins Trust