1. HIV&STI Department, Health Protection Services, Public Health England, London, United Kingdom
2. Health Protection Scotland, United Kingdom
3. Public Health Wales, United Kingdom
4. Eastern Field Epidemiological Unit, Public Health England, United Kingdom
5. Anglia & Essex Public Health England Centre, United Kingdom
6. South Midlands and Hertfordshire Public Health England Centre, United Kingdom
7. Yorkshire and Humber Field Epidemiological Unit Public Health England, United Kingdom
8. Betsi Cadwaladr University Health Board, United Kingdom
9. NHS Lanarkshire, United Kingdom
10. NHS Tayside, United Kingdom