1. Centers for Disease Control and Prevention (CDC). Sexual Risk Behaviors: HIV, STD, & Teen Pregnancy Prevention. Div Adolesc Sch Heal Natl Cent HIV/AIDS, Viral Hepatitis, STD, TB Prev 2018. https://www.cdc.gov/healthyyouth/sexualbehaviors/ (accessed June 10, 2019).
2. Youth risk behavior surveillance — United States, 2017;Kann;MMWR Surveill Summ.,2018
3. Child Trends Databank. Condom Use. Child Trends 2016. https://www.childtrends.org/indicators/condom-use (accessed June 10, 2019).
4. Women’s barrier contraceptive methods: poised for change;Narrigan;J. Midwifery Womens Health,2006
5. New female condoms in the pipeline;Beksinska;Reprod. Health Matters,2012