1. Unintended pregnancy in the United States;Henshaw;Fam Plann Perspect,1998
2. Contraceptive use among U.S. women having abortions in 2000–2001;Jones;Perspect Sex Reprod Health,2002
3. Abortion incidence and services in the United States in 2000;Finer;Perspect Sex Reprod Health,2003
4. Little knowledge and limited practice;Delbanco;Obstet Gynecol,1997
5. The Henry J. Kaiser Family Foundation. Third National Survey of Women's Health Care Providers on Reproductive Health. Survey Snapshot: Women's health care providers experiences with emergency contraception, November 2000. Available at: http://www.kff.org/content/2000/3085/Survey/SurveySnapshot.pdf. Accessed June 2003