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UNAIDS and the UNAIDS Reference Group publish a biennial methods journal supplement comprised of a series of papers that detail the improved methods, approaches, and tools through which country teams create country-specific modelled estimates of their HIV epidemic. The 2019 supplement was published in the journal AIDS, and consisted of ten papers (listed below) and available open access here.

• Summarizing the results and methods of the 2019 Joint United Nations Programme on HIV/AIDS HIV estimates (Case et al., 2019)
• HIV estimates through 2018: data for decision-making (Mahy et al., 2019)
• Global; regional and country-level 90–90–90 estimates for 2018: assessing progress towards the 2020 target (Marsh et al., 2019)
• Updates to the Spectrum/AIM model for estimating key HIV indicators at national and subnational levels (Stover et al., 2019)
• The Estimation and Projection Package Age-Sex Model and the r-hybrid model: new tools for estimating HIV incidence trends in sub-Saharan Africa (Eaton et al., 2019)
• Estimating and projecting the number of new HIV diagnoses and incidence in Spectrum's case surveillance and vital registration tool (Mahiane et al., 2019)
• National HIV testing and diagnosis coverage in sub-Saharan Africa: a new modeling tool for estimating the ‘first 90’ from program and survey data (Maheu-Giroux et al., 2019)
• Parameter estimates for trends and patterns of excess mortality among persons on antiretroviral therapy in high-income European settings (Trickey et al., 2019)
• Global variations in mortality in adults after initiating antiretroviral treatment: an updated analysis of the International epidemiology Databases to Evaluate AIDS cohort collaboration (Johnson et al., 2019)
• HIV surveillance based on routine testing data from antenatal clinics in Malawi (2011–2018): measuring and adjusting for bias from imperfect testing coverage (Maheu-Giroux et al., 2019)