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Prevalence of axial spondyloarthritis (SpA) subtypes in various countries. Data extracted from published studies.10–19 uSpA, undifferentiated spondyloarthritis; PsA, psoriatic arthritis; ReA, reactive arthritis; nr-axSpA, nonradiographic axial spondyloarthritis; IBD + SpA, inflammatory bowel disease with spondyloarthritis.
