Mark D. Sullivan, Mark J. Edlund, Ming-Yu Fan, Andrea DeVries, Jennifer Brennan Braden, Bradley C. Martin,
Trends in use of opioids for non-cancer pain conditions 2000-2005 in commercial and Medicaid insurance plans: the TROUP study. Pain. ,vol. 138, pp. 440- 449 ,(2008) ,
10.1016/J.PAIN.2008.04.027