1. Births: Final data for 2006;Martin,2009
2. Disparities in rates of unintended pregnancy in the United States, 1994 and 2001;Finer;Perspect Sex Reprod Health,2006
3. Abortion surveillance–United States, 2005;Gamble;MMWR Surveill Summ,2008
4. Teenagers in the United States: sexual activity, contraceptive use, and childbearing, 2002;Abma;Vital Health Stat,2004
5. Contraceptive use among U.S. women having abortions in 2000-2001;Jones;Perspect Sex Reprod Health,2002