title: Review: Nonradiographic axial spondyloarthritis: new definition of an old disease?
authors.affiliation: Charité Universitätsmedizin, Campus Benjamin Franklin, Berlin, Germany. joachim.sieper@charite.de
authors.forename: Joachim
authors.initials: J
authors.lastname: Sieper
authors.forename: Désirée
authors.initials: D
authors.lastname: van der Heijde
mesh_terms: D042241:Early Diagnosis; D006801:Humans; D011859:Radiography; D012219:Rheumatology / Q000639:trends*; D058566:Sacroiliitis / Q000145:classification* / Q000175:diagnosis* / Q000000981:diagnostic imaging; D025241:Spondylarthritis / Q000145:classification* / Q000175:diagnosis* / Q000000981:diagnostic imaging; D009626:Terminology as Topic