Published on in Vol 4, No 2 (2018): Apr-Jun
1 Centre for Population Research in Sexual Health and HIV, Institute for Global Health, University College London, London, United Kingdom
2 Centre for Infectious Disease Surveillance and Control, HIV & STI Department, Public Health England, London, United Kingdom
3 The National Institute for Health Research, Health Protection Research Unit in Blood Borne and Sexually Transmitted Infections, University College London / Public Health England / London School of Hygiene & Tropical Medicine, London, United Kingdom
4 Sigma Research, Public Health, Environments and Society, London School of Hygiene & Tropical Medicine, London, United Kingdom
*these authors contributed equally