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. 2016 Jun 7;18:132. doi: 10.1186/s13075-016-1027-9

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Study flowchart. AS ankylosing spondylitis, ASAS Assessment of SpondyloArthritis international Society, CLBP chronic low back pain, CRF case report form, IBP inflammatory back pain, Modified NY criteria Modified New York criteria for ankylosing spondylitis, nr-axSpA nonradiographic axial spondyloarthritis, SpA spondyloarthritis