Correction
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Castro A, Jost H, Cox D, *et al.* A comparison of the analytical level of agreement of nine treponemal assays for syphilis and possible implications for screening algorithms. *BMJ Open* 2013;3:[e003347](http://bmjopen.bmj.com/lookup/doi/10.1136/bmjopen-2013-003347). The order of the authors was published incorrectly in this paper. The correct order is: Heather Jost, Arnold Castro, David Cox, Yetunde Fakile, Susan Kikkert, Ye Tun, Akbar Zaidi, Mahin Park.