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An editorial expression of concern (EEoC) is issued by editors or publishers to draw attention to potential problems in a publication, without itself constituting a retraction or correction. The PubMed Commons team identified EEoCs issued for publications in PubMed and PMC through 2016. This work was published in Research Integrity and Peer Review on 27 May 2017 (http://dx.doi.org/10.1186/s41073-017-0030-2).