Reference:
1. Chisholm-Burns MA, Schwinghammer TL, Wells BG, Malone PM, Kolesar JM, Dipiro JT, editors. Pharmacotherapy principles and practice. 2nd ed. New York: McGraw-Hill; 2010.
2. Emergency contraception. World Health Organization. 2016. Available from: http://who.int/mediacentre/factsheets/fs244/en/
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