Reference:
1. U.S. Selected Practice Recommendations for Contraceptive Use, 2013. MMWR 2013; 62 (5):1-60.
2. MICROMEDEX 2.0® [Database on the internet]: Truven health analytics; 2013. mobileMicromedex®, contraceptive combinations :[cited 2013 Nov 8]. Available from: http://www.micromedexsolutions.com
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