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Hong-lin Chen, Kun Liu, Qin-Sheng You. Attention should be paid to preventing knee injury in tai chi exercise. Inj Prev 2011;17:286–287. doi:10.1136/injuryprev-2011-040027. This article was published in print with the incorrect DOI. The correct DOI is 10.1136/injuryprev-2011-40027. This was the DOI published online first and therefore the DOI of record.