Abstract
BackgroundSpondyloarthritis (SpA), including ankylosing spondylitis (AS), psoriatic arthritis (PsA), reactive arthritis (ReA), enteropathic arthritis, undifferentiated spondyloarthritis (uSpA), and synovitis-acne-pustulosis-hyperostosis-osteitis (SAPHO) syndrome, often involves the entheses. The differences between early-onset and...
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