Sato, MD, T., Kikura, MD, M. and Sato, MD, PhD, S. 2013. The characteristics of postoperative fentanyl effect-site concentration during intravenous fentanyl analgesia after posterior lumbar spine fusion. Journal of Opioid Management. 9, 5 (Sep. 2013), 335–342. DOI:https://doi.org/10.5055/jom.2013.0176.