title: Outcome assessment in clinical trials of ankylosing spondylitis.
authors.forename: A S
authors.initials: AS
authors.lastname: Rigby
authors.forename: A J
authors.initials: AJ
authors.lastname: Silman
mesh_terms: D002986:Clinical Trials as Topic; D006801:Humans; D017063:Outcome Assessment, Health Care; D013167:Spondylitis, Ankylosing / Q000188:drug therapy*