Webster, MD, L., Richards, MD, PhD, P., Stern, PhD, W. and Kelen, RN, BA, CNN, R. (2018) “A double-blind, placebo-controlled study of dual-opioid treatment with the combination of morphine plus oxycodone in patients with acute postoperative pain”, Journal of Opioid Management, 6(5), pp. 329–340. doi: 10.5055/jom.2010.0030.