1. Ott MA, Sucato GS. Committee on Adolescence. Contraception for adolescents. Pediatrics. 2014; 134:e1257–e1281.
2. Martinez G, Copen CE, Abma JC. Teenagers in the United States: sexual activity, contraceptive use, and childbearing, 2006-2010 national survey of family growth. Vital Health Stat 23. 2011; (31):1–35.
3. Committee on Adolescent Health Care Long-Acting Reversible Contraception Working Group. The American College of Obstetricians and Gynecologists. Committee opinion no. 539: adolescents and long-acting reversible contraception: implants and intrauterine devices. Obstet Gynecol. 2012; 120:983–988.
4. Lee DY, Moon JM, Lee IS, Suh CS, Choi D. Factors associated with sexual debut during adolescence in the Republic of Korea. Sex Transm Infect. 2012; 88:481–483.
5. Lee IS, Choi GY, Cha SH, Park HY, Lee JJ. A survey on the sexual behavior of adolescents in South Korea: the third survey in 2007. Korean J Obstet Gynecol. 2010; 53:512–519.
6. Lee JY, Park SM, Ko YJ, Song YS. Necessity of education for oral contraceptive use in Korea: results from the fourth Korean national health and nutrition examination survey 2007-2009. Gynecol Obstet Invest. 2013; 76:44–50.
7. Korea Centers for Disease Control and Prevention. The 9th-11th Korean Youth Risk Behavior Web-Based Survey, 2013-2015 [Internet]. Cheongju: Korea Centers for Disease Control and Prevention;2016. 2016 Mar 7. Available from:
http://yhs.cdc.go.kr/new.
9. Santelli JS, Lindberg LD, Finer LB, Singh S. Explaining recent declines in adolescent pregnancy in the United States: the contribution of abstinence and improved contraceptive use. Am J Public Health. 2007; 97:150–156.
10. Godeau E, Nic Gabhainn S, Vignes C, Ross J, Boyce W, Todd J. Contraceptive use by 15-year-old students at their last sexual intercourse: results from 24 countries. Arch Pediatr Adolesc Med. 2008; 162:66–73.
11. Gavin L, MacKay AP, Brown K, Harrier S, Ventura SJ, Kann L, et al. Sexual and reproductive health of persons aged 10-24 years - United States, 2002-2007. MMWR Surveill Summ. 2009; 58:1–58.
12. Lee DY, Koo YA, Yoon BK, Choi D. Reproductive health characteristics of urban South Korean women. Gynecol Obstet Invest. 2010; 70:154–159.
13. Wellings K, Collumbien M, Slaymaker E, Singh S, Hodges Z, Patel D, et al. Sexual behaviour in context: a global perspective. Lancet. 2006; 368:1706–1728.