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3. U.S. Teenage Pregnancies, Births and Abortions, 2010: National and State Trends by Age, Race and Ethnicity;Kost,2014
4. Unintended pregnancy in the United States: incidence and disparities, 2006;Finer;Contraception,2011
5. Effectiveness of long-acting reversible contraception;Winner;N Engl J Med,2012