1. United Nations Office on Drugs and Crime (UNODC). World Drug Report 2015. Available at: http://www.unodc.org/wdr2015/
2. CDC. Wide-ranging OnLine Data for Epidemiologic Research (WONDER); 2014. Available at: http://wonder.cdc.gov/
3. U.S. Department of Justice, Drug Enforcement Administration. National Drug Threat Assessment Summary, 2015. Available at: https://www.dea.gov/docs/2015%20NDTA%20Report.pdf
4. Prescription Pain Medication Dependence