1. a King's College London, Department of Palliative Care, Policy and Rehabilitation , Cicely Saunders Institute , London , UK
2. b Research Department of Infection and Population Health , Royal Free University College Medical School , London , UK
3. c Brighton & Sussex University Hospitals NHS Trust , Brighton , UK
4. d Royal Free Centre for HIV Medicine , Royal Free University College Medical School , London , UK
5. e Department of Genitourinary Medicine , Mortimer Market Centre , Camden PCT, London , UK
6. f Homerton University Hospital NHS Foundation Trust , London , UK
7. g Department of Primary Care and Population Sciences , Royal Free University College Medical School , London , UK