Han, MD, PhD, H., Kass, DVM, PhD, P. H., Wilsey, MD, B. L., & Li, PhD, C.-S. (2013). Age, gender, and earlier opioid requirement associations with the rate of dose escalation in long-term opioid therapy. Journal of Opioid Management, 9(2), 129—138. https://doi.org/10.5055/jom.2012.0154