Ruan, MD, X., Montagnini, MD, FACP, M. and Walters, MD, B.J. 2018. Current concepts in the management of opioid-induced constipation: A perfect review with an imperfect concept. Journal of Opioid Management. 7, 3 (Jan. 2018), 167–172. DOI:https://doi.org/10.5055/jom.2011.0059.