1. Declines in unintended pregnancy in the United States, 2008-2011;Finer;N Engl J Med.,2016
2. Rural-urban disparities in pregnancy intentions, births, and abortions among US adolescent and young women, 1995-2017;Sutton;Am J Public Health,2019
3. Use of emergency contraception among women aged 15-44: United States, 2006-2010;Daniels;NCHS Data Brief,2013
4. National Center for Health Statistics. Key statistics from the National Survey of Family Growth: Emergency contraception. Available from: https://www.cdc.gov/nchs/nsfg/key_statistics/e.htm#emergency; 2017. [Accessed: March 11, 2020].
5. State of emergency contraception in the U.S., 2018;Haeger;Contracept Reprod Med.,2018