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Diagnostic delay is one of the key clinical challenges in ankylosing spondylitis (AS). Recent publications have continued to show an average delay of 8–10 years.1 ,2 We read with interest that the diagnostic delay in the DANBIO cohort had apparently reduced from 66 months in 2000 to 4 months in 2011.3
In our opinion, however, there is a potential methodological problem with this paper. The authors have implied that they have a prospective study following …
Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.
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