Reference:
1. Gemzell-Danielsson K, Berger C, Lalitkumar P. Emergency contraception mechanisms of action. Contraception. 2012; 87:300-8.
2. Drug Information Lexicomp: levonogestrel. USA: Up to date Inc; 2017. Available from: https://www.uptodate.com
3. World Health Organization. Emergency contraception. 2017. Available from: http://www.who.int/mediacentre/factsheets/fs244/en/.
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