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Several errors occurred in an article published in the July issue of the journal (Evans AR, Wiggins RD, Mercer CH, et al. Men who have sex with men in Great Britain: comparison of a self-selected internet sample with a national probability sample. Sex Transm Infect 2007;83:200–5.) A corrected version of the article is available on our website at http://sti.bmj.com/supplemental.