FrenkSMPorterKSPaulozziLJ, Prescription opioid analgesic use among adults: United States, 1999–2012. NCHS Data Brief No. 189. Hyattsville (MD): National Center for Health Statistics (US); February 2015.
2.
BranumAMJonesJ.Trends in long-acting reversible contraception use among U.S. women aged 15–44. NCHS Data Brief No. 188. Hyattsville (MD): National Center for Health Statistics (US); February 2015.
3.
CohenRA, Problems paying medical bills among persons under age 65: Early release of estimates from the National Health Interview Survey, 2011–June 2014. Hyattsville (MD): National Center for Health Statistics (US); 2015.
4.
Centers for Disease Control and Prevention (US). FastStats [cited 2015 Mar 6. Available from: URL: http://www.cdc.gov/nchs/fastats.
