1. HIV & STI Department, Public Health England, Colindale, London, UK
2. The Royal London Hospital, London, UK
3. The Mortimer Market Centre, NHS Camden Provider Services, London, UK
4. Health Protection Scotland, Edinburgh, UK
5. Public Health Agency, Health and Social Care Northern Ireland, Belfast, UK
6. Communicable Disease Surveillance Centre, Public Health Wales, Cardiff, UK
7. Sandyford Sexual Health Services, NHS Greater Glasgow and Clyde, Scotland, UK
8. Imperial College Healthcare NHS Trust, London, UK
9. NHS Infectious Diseases in Pregnancy Screening Programme, PHE Screening, London, UK