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. 2018 Jan 17;77(5):699–705. doi: 10.1136/annrheumdis-2017-212377

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Radiographic imaging results of the spine to week 204. AS, ankylosing spondylitis; LS, least squares; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; nr-axSpA, non-radiographic axial spondyloarthritis.