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2. Disparities in rates of unintended pregnancy in the United States, 1994 and 2001;Finer;Perspect Sex Reprod Health,2006
3. Committee opinion no. 539: adolescents and long-acting reversible contraception: implants and intrauterine devices;Obstet Gynecol,2012
4. Romero L, Pazol K, Warner L, et al: Vital signs: trends in use of long-acting reversible contraception among teens aged 15–19 years seeking contraceptive services — United States, 2005–2013. Available: http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6413a6.htm?s_cid=mmmm6413a6_w. Accessed October 28, 2015.
5. Game change in Colorado: widespread use of long-acting reversible contraceptives and rapid decline in births among young, low-income women;Ricketts;Perspect Sex Reprod Health,2014