Walters, MD, John Brandon, and Marcos Montagnini, MD, FACP. “Current Concepts in the Management of Opioid-Induced Constipation”. Journal of Opioid Management 6, no. 6 (January 29, 2018): 435–444. Accessed April 28, 2024. https://wmpllc.org/ojs/index.php/jom/article/view/913.