Reference:
1. Armstrong C. ACOG recommendations on emergency contraception. Am Fam Physician 2010; 15: 1278.
2. Piaggio G, Kapp N, von Hertzen H. Effect on pregnancy rates of the delay in the administration of levonorgestrel for emergency contraception: a combined analysis of four WHO trials. Contraception 2011;84:35–9
3. http://www.pharmacy.mahidol.ac.th/thai/knowledgeinfo.php?id=54
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