Licht, MD, E., E. L. Siegler, MD, and M. C. Reid, MD, PhD. “Can the Cognitively Impaired Safely Use Patient-Controlled Analgesia?”. Journal of Opioid Management, vol. 5, no. 5, Jan. 2018, pp. 307-12, doi:10.5055/jom.2009.0031.