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APA Citation
Johnson, L. F., Mulongeni, P., Marr, A., & Lane, T. (2018). age bias in survey sampling and implications for estimating HIV prevalence in men who have sex with men: insights from mathematical modelling. Epidemiology and infection, 146(8), 1036–1042. http://access.bl.uk/ark:/81055/vdc_100077475077.0x000028