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Martell, Bridget A., Patrick G. O'Connor, Robert D. Kerns, William C. Becker, Knashawn H. Morales, Thomas R. Kosten, and David A. Fiellin. "Systematic review: opioid treatment for chronic back pain: prevalence, efficacy, and association with addiction." \i Annals of internal medicine\i0  146, no. 2 (2007): 116-27.\par \par }