1. CDC. Preexposure prophylaxis for the prevention of HIV infection in the United States—2017 update: a clinical practice guideline. Atlanta, GA: US Department of Health and Human Services, CDC; 2018. https://www.cdc.gov/hiv/pdf/risk/prep/cdc-hiv-prep-guidelines-2017.pdf
2. Gilead Sciences Inc. U.S. Food and Drug Administration approves expanded indication for Truvada (emtricitabine and tenofovir disoproxil fumarate) for reducing the risk of acquiring HIV-1 in adolescents [Press release]. Foster City, CA: Gilead Sciences Inc.; 2018. https://www.gilead.com/news-and-press/press-room/press-releases/2018/5/us-food-and-drug-administration-approves-expanded-indication-for-truvada-emtricitabine-and-tenofovir-disoproxil-fumarate-for-reducing-the-risk-of-
3. Descovy (emtricitabine and tenofovir alafenamide) [Package insert]. Foster City, CA: Gilead Sciences Inc.; 2019. https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/208215s011lbl.pdf
4. CDC. HIV surveillance report, 2018 (preliminary); vol. 30. Atlanta, GA: US Department of Health and Human Services, CDC; 2019. https://www.cdc.gov/hiv/library/reports/hiv-surveillance.html
5. Incidence of HIV infection and sexually transmitted infections and related risk factors among very young men who have sex with men.;Garofalo;J Acquir Immune Defic Syndr,2016