title: The challenge of diagnosis and classification in early ankylosing spondylitis: do we need new criteria?
authors.affiliation: Charité, Campus Benjamin Franklin, Berlin, Germany. martin.rudwaleit@charite.de
authors.forename: Martin
authors.initials: M
authors.lastname: Rudwaleit
authors.forename: Muhammad A
authors.initials: MA
authors.lastname: Khan
authors.forename: Joachim
authors.initials: J
authors.lastname: Sieper
mesh_terms: D042241:Early Diagnosis; D006801:Humans; D012219:Rheumatology / Q000379:methods*; D013167:Spondylitis, Ankylosing / Q000145:classification* / Q000175:diagnosis*; D009626:Terminology as Topic