1. United Nations Office on Drugs and Crime (UNODC) World Drug Report 2012 2012
2. Drug poisoning deaths in the United States, 1980-2008;Warner;NCHS Data Brief,2011
3. Drug-poisoning deaths involving opioid analgesics: United States, 1999-2011;Chen;NCHS Data Brief,2014
4. Drug-poisoning deaths involving heroin: United States, 2000-2013;Hedegaard;NCHS Data Brief,2015
5. Increases in drug and opioid overdose deaths-United States, 2000-2014;Rudd;Morb Mort Wkly Rep,2016