1. CDC. Common elements in guidelines for prescribing opioids for chronic pain. [Online]. http://www.cdc.gov/homeandrecreationalsafety/pdf/Common_Elements_in_Guidelines_for_Prescribing_Opioids-a.pdf . Accessed 12 Jun 2015.
2. Chou R, Fanciullo G, Fine P, et al. Clinical guidelines for the use of chronic opioid therapy in chronic noncancer pain. American Pain Society & American Academy of Pain Medicine Opioids guideline panel. Pain. 2009;10(2):113–30.
3. VA/DoD. Clinical practice guideline for management of opioid therapy for chronic pain. 2010. [Online]. http://www.va.gov/painmanagement/docs/cpg_opioidtherapy_fulltext.pdf . Accessed 14 Jun 2015.
4. Manchikanti L, Abdi S, Atluri S, et al. American Society of Interventional Pain Physicians (ASIPP) guidelines for responsible opioid prescribing in chronic non-cancer pain: part 2-guidance. Pain Physician. 2012;15:S67–116.
5. Nuckols T, Anderson L, Popescu I, et al. Opioid prescribing: a systematic review and critical appraisal of guidelines for chronic pain. Ann Intern Med. 2014;160(1):38–47.