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. 2020 Mar 2;107(4):915–925. doi: 10.1002/cpt.1785

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© 2020 The Authors. Clinical Pharmacology & Therapeutics published by Wiley Periodicals, Inc. on behalf of American Society for Clinical Pharmacology and Therapeutics.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Proportion of children 0–17 years with codeine treatment within 30 days of undergoing tonsillectomy or adenoidectomy by six monthly periods in IQVIA Medical Research Data (IMRD)‐UK source vs. IMRD‐UK Observational Medical Outcome Partnership common data model (CDM; database version 1705). The black vertical line represents the date of introducing the risk minimization measures. The x‐axis shows the half year (H1 = January 1 to June 30, H2 = July 1 to December 31). [Colour figure can be viewed at http://wileyonlinelibrary.com]