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3. National Center for Health Statistics NCHS data on drug poisoning deaths [Internet] http://www.cdc.gov/nchs/data/factsheets/factsheet_drug_poisoning.pdf
4. Number of deaths from poisoning, drug poisoning, and drug poisoning involving opioid analgesics - United States, 1999-2010. QuickStats;Chen;MMWR Morb Mortal Wkly Rep,2013
5. Increase in fatal poisonings involving opioid analgesics in the United States, 1999-2006;Warner;NCHS Data Brief,2009