1. 1. Overdose Death Rates. 2017. Available from: https://www.drugabuse.gov/related-topics/trends-statistics/overdose-death-rates. Accessed 2017 Jan 7.
2. Increases in Drug and Opioid Overdose Deaths--United States, 2000-2014;Rudd;Morb Mortal Wkly Rep,2016
3. Treatment utilization among persons with opioid use disorder in the United States;LT;Drug Alcohol Depend,2016
4. 4. IMS Institute for Healthcare Informatics. Medicines Use and Spending in the U.S. A Review of 2015 and Outlook to 2020. City (Country): IMS Institute for Healthcare Informatics
5. April 2016. Available from: http://www.imshealth.com/en/thought-leadership/quintilesims-institute/reports/medicines-use-and-spending-in-the-us-a-review-of-2015-and-outlook-to-2020. Accessed 2016 Dec 6.