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2. Substance Abuse and Mental Health Services Administration Behavioral health trends in the United States: results from the 2014 National Survey on drug use and health 2015 http://www.samhsa.gov/data/sites/default/files/NSDUH-FRR1-2014/NSDUH-FRR1-2014.pdf
3. https://wonder.cdc.gov/
4. Vital signs: overdoses of prescription opioid pain relievers - United States, 1999-2008;Paulozzi;MMWR,2011
5. Prescription Drug Monitoring Program Center of Excellence http://pdmpexcellence.org/content/addressing-problem