1. Opioid Analgesics and Rates of Fatal Drug Poisoning in the United States
2. Unintentional drug overdose death trends in New Mexico, USA, 1990-2005: combinations of heroin, cocaine, prescription opioids and alcohol
3. Pain-management clinics. Florida 458.3265 (2011). Available at: http://www.leg.state.fl.us/Statutes/index.cfm?App_mode=Display_Statute&Search%20_String=&URL=0400-0499/0458/Sections/0458.3265.html (accessed December 13, 2012).
4. WAC 246-919-860 (2012). Recommendations and requirements. Available at: http://apps.leg.wa.gov/WAC/default.aspx?cite=246-919-860 (accessed December 13, 2012).
5. Office of National Drug Control Policy. The 2011 Prescription Drug Abuse Prevention Plan; 2011. Available at: http://www.whitehouse.gov/ondcp/prescription-drug-abuse (accessed September 16, 2012).