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In the article by Kang et al in the May 2009 issue of Arthritis Care & Research (pp. 641–647) Figure 1 was incorrect. The Figure was inadvertently duplicated from another article during production. The correct Figure 1 is reproduced below and has been corrected in the online version of the article (http://www3.interscience.wiley.com//journal/77005015/home).

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Figure 1. Study flow chart.

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We regret the error.