1. Governale L . Outpatient prescription opioid utilization in the U.S., years 2000–2009. 2010. Available at: http://www.fda.gov/downloads/AdvisoryCommittees/CommitteesMeetingMaterials/Drugs/AnestheticAndLifeSupportDrugsAdvisoryCommittee/UCM220950.pdf (accessed February 2012).
2. Clinical Guidelines for the Use of Chronic Opioid Therapy in Chronic Noncancer Pain
3. The Use of Opioids for the Treatment of Chronic Pain*
4. Substance Abuse and Mental Health Services Administration. Results from the 2010 National Survey on Drug Use and Health: Summary of National Findings, NSDUH Series H-41, HHS Publication No. (SMA) 11-4658. 2011. Available at: http://oas.samhsa.gov/NSDUH/2k10NSDUH/2k10Results.htm (accessed September 2011).
5. Societal Costs of Prescription Opioid Abuse, Dependence, and Misuse in the United States