Ankylosing spondylitis in twins: comment on the article by Brown et al.
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D000328:Adult; D000367:Age Factors; D000368:Aged; D006801:Humans; D008875:Middle Aged; D015995:Prevalence; D013167:Spondylitis, Ankylosing / Q000453:epidemiology*; D018433:Twin Studies as Topic