Reference:
1. Zhang L, Chen J, Wang Y, Ren F, Yu W, Cheng L. Pregnancy outcome after levonorgestrel-only emergency contraception failure: a prospective cohort study. Hum Reprod 2009; 24(7): 1605-11.
2. Faculty of Sexual and Reproductive Healthcare. Clinical Guidance: Emergency Contraception: Faculty of Sexual and Reproductive Healthcare; 2012.
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