1. CDC guideline for prescribing opioids for chronic pain—United States, 2016;Centers for Disease Control and Prevention;MMWR Recomm Rep,2016
2. Estimates of pain prevalence and severity in adults: United States, 2012;Nahin;J Pain,2015
3. Relieving pain in America: a blueprint for transforming prevention, care, education, and research;Institute of Medicine,2011
4. Clinical guidelines for the use of chronic opioid therapy in chronic noncancer pain;Chou;J Pain,2009
5. Trends in de-facto long-term opioid therapy for chronic non-cancer pain;Boudreau;Pharmacoepidemiol Drug Saf,2009