1. Substance Abuse and Mental Health Services Administration [Internet] Results from the 2014 National Survey on Drug Use and Health: detailed tables 2016 http://www.samhsa.gov/data/sites/default/files/NSDUH-DetTabs2014/NSDUH-DetTabs2014.pdf
2. Centers for Disease Control and Prevention [Internet] Prescription opioid overdose data 2016 https://www.cdc.gov/drugoverdose/data/overdose.html
3. Centers for Disease Control and Prevention [Internet] Injury prevention and control: opioid overdose-understanding the epidemic 2016 https://www.cdc.gov/drugoverdose/epidemic/index.html
4. National Institute on Drug Abuse [Internet] Overdose death rates 2015 https://www.drugabuse.gov/related-topics/trends-statistics/overdose-death-rates
5. Association between opioid prescribing patterns and opioid overdose-related deaths;Bohnert;JAMA,2011