Patel, A., Kim, J., Brown, D., Lin, H.-M., Ouyang, Y. and Shekane, P. (2023) “Chronic opioid use and mortality outcomes in patients admitted with COVID-19: A retrospective cohort study”, Journal of Opioid Management, 19(4), pp. 321–327. doi: 10.5055/jom.2023.0789.