Reference:
1. Levonorgestrel .In: DRUGDEX System [database on the internet]. Ann Arbor (MI): Truven Health Analytics; 2014[cited 10 Jan 2014]. Available from: www.micromedexsolutions.com.
2. http://www.accessdata.fda.gov/drugsatfda_docs/label/2009/021998lbl.pdf
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