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Characteristics of the familial form of ankylosing spondylitis (AS) compared to sporadic AS
*Pack-years is calculated based on the smoking history of current and ex-smokers; †Significant difference (P<0.05); ‡Significant difference (P<0.01). SD, standard deviation; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein; BMI, body mass index.
