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The authors and the editors are issuing an Expression of Concern about the article entitled "Modelling the effect of Chlamydia trachomatis testing on the prevalence of infection in England: what impact can we expect from the National Chlamydia Screening Programme?", which was published online in Sexually Transmitted Infections on June 26, 2012 (doi:10.1136/sextrans-2011-050126).
This is to make readers aware that, as a result of ongoing work using the model, the authors noticed a coding error. The authors are re-fitting the corrected model. In the meantime, the journal, in agreement with the authors, is delaying print publication of this article pending revisions. Readers requiring further information should contact the corresponding author Kate Soldan at Kate.Soldan@hpa.org.uk or the journal's Editor-in-Chief at email@example.com.
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