1. U.S. teenage pregnancies, births and abortions, 2008: state trends by age, race and ethnicity;Kost,2013
2. Disparities in rates of unintended pregnancy in the United States, 1994 and 2001;Finer;Perspect Sex Reprod Health,2006
3. In brief: facts on induced abortion in the United States;Guttmacher Institute,2013
4. Teenagers in the United States: sexual activity, contraceptive use, and childbearing, 2006-2010 national survey of family growth;Martinez;Vital Health Stat 23,2011
5. Explaining recent declines in adolescent pregnancy in the United States: the contribution of abstinence and improved contraceptive use;Santelli;Am J Public Health,2007