M. E. Hale, MD, T. R. Zimmerman, MD, E. Eyal, MSc, and R. Malamut, MD, “Efficacy and safety of a hydrocodone extended-release tablet formulated with abuse-deterrence technology in patients with moderate-to-severe chronic low back pain”, J of Opioid Management, vol. 11, no. 6, pp. 507–518, Nov. 2015.