Reference:
1. Armstrong C. ACOG recommendations on emergency contraception. Am Fam Physician 2010; 15: 1278.
2. Levonorgestrel. In: DRUGDEX System [database on the Internet]. Ann Arbor (MI): Truven Health Analytics; 2014. Available from: www.micromedexsolutions.com.
3. http://www.pharmacy.mahidol.ac.th/thai/knowledgeinfo.php?id=54
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