1. Immunisation, Hepatitis and Blood Safety department, National Infection Service, Public Health England, Colindale, London, United Kingdom
2. Field Epidemiology Services East Midlands, Public Health England, United Kingdom
3. HIV and STI department, National Infection Service, Public Health England, Colindale, London, United Kingdom
4. Field Epidemiology Services London, Public Health England, United Kingdom
5. Hampshire & Isle of Wight Health Protection Team (South East), Public Health England, United Kingdom
6. East Midlands Health Protection Team, Public Health England, United Kingdom
7. South West Health Protection Team, Public Health England, United Kingdom
8. Virus Reference Department, Public Health England, Colindale, London, United Kingdom