title: Low Rate of Progression to Ankylosing Spondylitis Among Patients With Presumed Nonradiographic Axial Spondyloarthritis: Comment on the Article by Wang et al.
authors.affiliation: Rheumazentrum Ruhrgebiet, Herne, Germany.
authors.forename: Juergen
authors.initials: J
authors.lastname: Braun
authors.affiliation: UKBF Charité Berlin, Berlin, Germany.
authors.forename: Joachim
authors.initials: J
authors.lastname: Sieper
mesh_terms: D015331:Cohort Studies; D018450:Disease Progression; D006801:Humans; D012107:Research Design; D025241:Spondylarthritis; D013167:Spondylitis, Ankylosing