Bennett, MD, D.S., Simon, MD, RPh, S., Brennan, MD, M. and Shoemaker, MD, S.A. 2007. Prevalence and characteristics of breakthrough pain in patients receiving opioids for chronic back pain in pain specialty clinics. Journal of Opioid Management. 3, 2 (Mar. 2007), 101–106. DOI:https://doi.org/10.5055/jom.2007.0046.