1. International narcotics control board. Narcoticdrugs: estimated world requirements for 2015 (Statistics for 2013). 2015. https://www.incb.org/documents/Narcotic-Drugs/TechnicalPublications/2014/Narcotic_Drugs_Report_2014.pdf (accessed 25 January 2016).
2. Increases in drug and opioid overdose deaths--United States, 2000-2014;Rudd;MMWR Morb Mortal Wkly Rep,2016
3. Pharmaceutical overdose deaths, United States, 2010;Jones;Jama,2013
4. Vital signs: overdoses of prescription opioid pain relievers---United States, 1999--2008;Centers for Disease Control and Prevention (CDC);MMWR Morb Mortal Wkly Rep,2011
5. Trends in opioid use and dosing among socio-economically disadvantaged patients;Gomes;Open Med,2011