Efficacy of sulfasalazine in patients with inflammatory back pain due to undifferentiated spondyloarthritis and early ankylosing spondylitis: a multicentre randomised controlled trial.
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Abstract
To assess the effect of sulfasalazine (SSZ) on inflammatory back pain (IBP) due to
active undifferentiated spondyloarthritis (uSpA) or ankylosing spondylitis in patients
with symptom duration <5 years.