1. Waldron Sexual Health Centre, Lewisham and Greenwich NHS Trust, London, UK
2. Cambridge Institute of Public Health, University of Cambridge, Cambridge, UK
3. Infectious Disease Institute, Makerere University College of Health Sciences, Kampala, Uganda
4. Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
5. King’s College Hospital, London, UK
6. Division of Infectious Diseases, Department of Medicine, Johns Hopkins University, Baltimore, MD, USA