Youssef, MD, MBA, E., Gao, MD, H. T., Russell, MD, C., Hassan, MD, S., Ardolic, MD, B. and Hahn, MD, B. (2018) “Characteristics of prior emergency departments visits associated with subsequent opioid overdose”, Journal of Opioid Management, 14(5), pp. 327–333. doi: 10.5055/jom.2018.0465.