%0 Journal Article %B Ann Intern Med %D 2015 %G eng %N 4 %P 276-86 %R 10.7326/M14-2559 %T The effectiveness and risks of long-term opioid therapy for chronic pain: a systematic review for a National Institutes of Health Pathways to Prevention Workshop. %V 162 %1 https://www.ncbi.nlm.nih.gov/pubmed/25581257 %8 02/2015