R. Mannino, MD, P. Coyne, MSN, APRN, C. Swainey, MD, L. A. Hansen, PharmD, and L. Lyckholm, MD, “Methadone for cancer-related neuropathic pain: A review of the literature”, J of Opioid Management, vol. 2, no. 5, pp. 269–276, Sep. 2006.