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. 2019 Oct 29;21:221. doi: 10.1186/s13075-019-2012-x

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© The Author(s). 2019

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 — Association between tender point counts and BASDAI scores stratified on sex and axSpA classification. a Nr-axSpA females. b Nr-axSpA males. c r-axSpA females. d r-axSpA males