N. E. Slatkin, MD, M. I. Rhiner, RN, MSN, NP, E. M. Gould, PhD, T. Ma, PhD, and H. Ahdieh, PhD, “Long-term tolerability and effectiveness of oxymorphone extended release in patients with cancer”, J of Opioid Management, vol. 6, no. 3, pp. 181–191, Jan. 2018.