[1] Faculty of Public Health & Policy,Research Department of Primary Care and Population Health
[2] London School of Hygiene & Tropical Medicine,Department of Primary Care and Public Health Medicine, Brighton and Sussex Medical School
[3] University College London,MRC/CSO Social & Public Health Sciences Unit
[4] Institute for Global Health,undefined
[5] University College London,undefined
[6] National Institute for Health Research Health Protection Research Unit (NIHR HPRU) in Blood Borne and Sexually Transmitted Infections at University College London in partnership with Public Health England (PHE),undefined
[7] in collaboration with London School of Hygiene & Tropical Medicine,undefined
[8] University of Brighton,undefined
[9] University of Glasgow,undefined