1. Wiltshire Sexual Health Service, Salisbury NHS Foundation Trust, Salisbury, Wiltshire, United Kingdom of Great Britain and Northern Ireland
2. Claude Nicol Centre, University Hospitals Sussex NHS Foundation Trust, Brighton, United Kingdom of Great Britain and Northern Ireland
3. Southampton Sexual Health Services, Solent NHS Trust, Southampton, United Kingdom of Great Britain and Northern Ireland
4. Locala Sexual Health, Bradford, United Kingdom of Great Britain and Northern Ireland
5. Leeds Sexual Health, Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom of Great Britain and Northern Ireland