For research reports: when two (or more) articles report the same analysis of the same data set, or contain relatively small amounts of new data or alternative analyses compared with the original publication, particularly when this is done in such a way that reviewers/readers are unlikely to realise that some of the findings have been published before
For reviews and editorials: when two (or more) review articles or editorials include material that has been published elsewhere by the author(s)
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