1. Current contraceptive use in the United States, 2006-2010, and changes in patterns of use since 1995;Jones;Natl Health Stat Report,2012
2. Current contraceptive use and variation by selected characteristics among women aged 15-44: United States, 2011-2013;Daniels;Natl Health Stat Report,2015
3. Romero L, Pazol K, Warner L, et al. Vital signs: trends in use of long-acting reversible contraception among teens aged 15–19 years seeking contraceptive services — United States, 2005–2013. Morbidity and Mortality Weekly Report April 10, 2015. 64;363-9.
4. Changes in use of long-acting reversible contraceptive methods among U.S. women, 2009-2012;Kavanaugh;Obstet Gynecol,2015
5. Birth spacing and risk of adverse perinatal outcomes: a meta-analysis;Conde-Agudelo;JAMA,2006