Chazan, RN, S., Ekstein, MD, M. P., Marouani, MD, N., & Weinbroum, MD, A. A. (2018). Ketamine for acute and subacute pain in opioid-tolerant patients. Journal of Opioid Management, 4(3), 173–180. https://doi.org/10.5055/jom.2008.0023