Article Text
Letter
Authors’ response
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We read with great interest and appreciation the comment by Dr Loffeld. His observation of selection bias towards patients with more severe disease is correct, and indeed was most likely to have been present in our data. We were fully aware of this during the study and therefore commented on it in the Discussion section of our original …
Footnotes
Competing interests: None.
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2009 BMJ Publishing Group and British Society of Gastroenterology