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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. The American College of Obstetricians and Gynecologists. ACOG supports safety and availability of over-the-counter emergency contraception. Available at: http://www.acog.org/from_home/publications/press-releases/nr02-28-01-2.cfm. Accessed April 4, 2005.


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


  4. 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.


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


  6. The American College of Obstetricians and Gynecologists. New ACOG leader promotes widespread advance prescriptions for emergency contraception. Available at: http://www.acog.org/from_home/publications/press-releases/nr04-30-01-1.cfm. Accessed April 4, 2005.


  7. The American College of Obstetricians and Gynecologists. ACOG to testify before FDA in support of over-the-counter emergency contraception. Available at: http://www.acog.org/from_home/publications/press-releases/nr12-15-03.cfm. Accessed April 4, 2005.


  8. Arowojolu AO, Okewkie IA, et al. Comparative evaluation of the effectiveness and safety of two regimens of levonorgestrel for emergency contraception in Nigerians. Contraception 2002: 66(4): 269-73.


  9. von Hertzen H, PiaggioG, et al. Low dose mifepristone and two regimens of levonorgestrel for emergency contraception: a WHO multicentre randomised trial. Lancet. 2002:360(9348): 1803-10


  10. Hamoda H, Ashok PW, et al. A randomized trial of mifepristone (10 mg) and levonorgestrel for emergency contraception. Obstetrics & Gynecology 2004:104(6): 1307-13.