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Visualization of approach to EHR‐identified AECOPD episode algorithm construction. Areas enclosed by braces are 14‐day (2‐week) periods. The grey brackets for episode duration show the start and end times of the two episodes deduced by applying the algorithm to these codes. Abbreviations: AECOPD, acute exacerbation of chronic obstructive pulmonary disease; EHR, electronic health record [Colour figure can be viewed at http://wileyonlinelibrary.com]
