1. GBD 2015 HIV Collaborators. Estimates of global, regional, and national incidence, prevalence, and mortality of HIV, 1980–2015: the Global Burden of Disease Study 2015. Lancet HIV 3, e361–387 (2016).
2. Joint United Nationals Programme on HIV/AIDS (UNAIDS). Fact sheet 2016. Available at:
http://www.unaids.org/sites/default/files/media_asset/20150901_FactSheet_2015_en.pdf
.
3. Darroch, J. E., Singh, S. & Weissman, E. Adding It Up: The Costs and Benefits of Investing in Family Planning and Maternal and Newborn Health 2014 - Estimation Methodology. (New York: Guttmacher Institute, 2016).
4. Butler, A. R. et al. Modelling the global competing risks of a potential interaction between injectable hormonal contraception and HIV risk. AIDS 27, 105–113 (2013).
5. Polis, C. B. et al. An updated systematic review of epidemiological evidence on hormonal contraceptive methods and HIV acquisition in women. AIDS 30, 2665–2683 (2016).