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Richards, Georgia C and Aronson, Jeffrey K and MacKenna, Brian and Goldacre, Ben and Hobbs, F D Richard and Heneghan, Carl (2022) Sales of over-the-counter products containing Codeine in 31 countries, 2013-2019: a retrospective observational study. Drug Safety, 45, pp. 237-247. https://doi.org/10.1007/s40264-021-01143-2.