1. Burden of unintended pregnancy in the United States: potential savings with increased use of long-acting reversible contraception;Trussell;Contraception,2013
2. Current contraceptive use in the United States, 2006-2010, and changes in patterns of use since 1995;Jones;National Health Statistics Reports,2012
3. Unintended pregnancy in the United States: incidence and disparities, 2006;Finer;Contraception,2011
4. U.S. Department of Health and Human Services Office of Disease Prevention and Health Promotion http://www.healthypeople.gov/2020/topicsobjectives2020/objectiveslist.aspx?topicId=13
5. Health Resources and Services Administration Women's preventive services: required heath plan coverage guidelines http://www.hrsa.gov/womensguidelines/