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  1. Task Force on Postovulatory Methods of Fertility Regulation. Randomised controlled trial of levonorgestrel versus the Yuzpe regimen of combined oral contraceptives for emergency contraception. Lancet. 1998;352:428-433.


  2. Henshaw SK. Unintended pregnancy in the United States. Family Planning Perspectives. 1998;30:24-29, 46.


  3. Jones RK, Henshaw D, Henshaw SK. Contraceptive use among U.S. women having abortions in 2000-2001. Perspect Sex Reprod Health. 2002;34:294-303.


  4. Dedicated emergency contraceptive pills worldwide. Available at: http://ec.princeton.edu/questions/dedicated.html. Accessed April 7, 2005.