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. 2018 Oct 3;20:221. doi: 10.1186/s13075-018-1724-7

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© The Author(s). 2018

Open Access This 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. 1 — Flow chart of patients included in the study from the REGISPONSER database. AS Ankylosing Spondylitis, ESSG European Spondyloarthropathy Study Group, nrAxSpA nonradiographic axial spondyloarthritis, NYm New York modified, PsA psoriatic arthritis, ReA reactive arthritis, USpA undifferentiated spondyloarthritis