Penson, MRCP, MD, R. T., Joel, PhD, S. P., Gloyne, BSc, A., Clark, BSc, S., & Slevin, FRCP, MD, M. L. (2005). Morphine analgesia in cancer pain: Role of the glucuronides. Journal of Opioid Management, 1(2), 83–90. https://doi.org/10.5055/jom.2005.0021