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Clinical response and body mass index (BMI) in ankylosing spondylitis (AS) patients after 6 months of treatment with infliximab, according to the three WHO BMI categories. BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; CRP, C-reactive protein; NSAIDs, nonsteroidal antiinflammatory drugs; VAS, visual analogue scale.
