Changes in opioid prescribing during the COVID-19 pandemic in England: cohort study of 20 million patients in OpenSAFELY-TPP
Schaffer A., Andrews C., Brown A., Croker R., Hulme W., Nab L., Quinlan J., Speed V., Wood C., Wiedemann M., Massey J., Inglesby P., Bacon SCJ., Mehrkar A., Bates C., Goldacre B., The OpenSAFELY Collaborative ., Walker A., MacKenna B.