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Posted by dcoggon on 05 Dec 2013 at 14:52 GMT

We have discovered a typographical error in footnote c of Table 9 of this paper. The footnote should have read “Completely agree that for someone with such pain, neglecting problems of this kind can cause serious health problems, and completely disagree that such problems usually get better within three months”. We apologise for this error.

No competing interests declared.