In the article by Collier et al in the April 2009 issue of Arthritis Care & Research (pp. 496–500), the key for Figure 4 was incorrect. The key for A should have read, (filled squares) MD Prediction Does Not Concur With DAS28, (open squares) MD Prediction Concurs With DAS28; and the key for B should have read (filled squares) DAS28 Does Not Concur With MD Prediction, (open squares) DAS28 Concurs With MD prediction. This has been corrected in the online version of the article (http://www3.interscience.wiley.com/journal/122290947/abstract).
We regret the error.