Reference:
1. World Health Organization. Emergency contraception, 2017. http://www.who.int/mediacentre/factsheets/fs244/en/
2. MIMS Online Thailand. oral contraceptive. 2017. http://mims.com/thailand.
3. Shohel M, Rahman M, Zaman A, Uddin M, Al-Amin M, Reza H. A systematic review of effectiveness and safety of different regimens of levonorgestrel oral tablets for emergency contraception. BMC Womens Health. 2014;14:1-10.
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