title: Comparison of sulfasalazine and placebo in the treatment of ankylosing spondylitis: comment on the article by Clegg et al.
authors.forename: P S
authors.initials: PS
authors.lastname: Helliwell
mesh_terms: D000893:Anti-Inflammatory Agents / Q000627:therapeutic use*; D018849:Controlled Clinical Trials as Topic; D006801:Humans; D010919:Placebos; D013167:Spondylitis, Ankylosing / Q000188:drug therapy*; D012460:Sulfasalazine / Q000627:therapeutic use*
chemical_list: D000893:Anti-Inflammatory Agents; D010919:Placebos; D012460:Sulfasalazine