Reference:
1. Centers for Disease Control and Prevention. U.S. Selected Practice Recommendations for Contraceptive Use, 2013. MMWR 2013; 62:1-60.
2. U.S. Department of Health and Human Services, Office on Women’s Health. Pregnancy tests. 2009. Available from: http://womenshealth.gov/publications/our-publications/fact-sheet/pregnancy-tests.pdf
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