1. Patrick Clements Clinic, Central Middlesex Hospital, London, United Kingdom
2. Clinical Governance Support Unit, Camden and Islington Community Health Services NHS Trust, London, United Kingdom
3. Department of Genitourinary/HIV Medicine, St. Mary's Hospital, Imperial College, London, United Kingdom
4. Tower Hamlets Health Authority, London, United Kingdom
5. Department of GU Medicine, West Middlesex University Hospital, Isleworth, Middlesex, United Kingdom
6. Ambrose King Centre, The Royal London Hospital, London, United Kingdom