title: The Assessment in Spondyloarthritis International Society (ASAS) classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general: the spondyloarthritis concept in progress.
authors.forename: Henning
authors.initials: H
authors.lastname: Zeidler
authors.forename: Bernard
authors.initials: B
authors.lastname: Amor
mesh_terms: D002690:Chlamydia Infections / Q000150:complications; D006801:Humans; D007391:International Cooperation; D025241:Spondylarthritis / Q000145:classification* / Q000175:diagnosis / Q000382:microbiology; D013167:Spondylitis, Ankylosing / Q000145:classification / Q000175:diagnosis / Q000382:microbiology