1. Opioid guidelines in the management of chronic non‐cancer pain;Trescot AM;Pain Physician,2006
2. Cost of pain medication to treat adult patients with nonmalignant chronic pain in the United States;Rasu RS;J Manag Care Spec Pharm,2014
3. ACOEM Practice Guidelines
4. American Society of Interventional Pain Physicians (ASIPP) guidelines for responsible opioid prescribing in chronic non‐cancer pain: part 2–guidance;Manchikanti LAS;Pain physician,2012