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. 2016 Oct 6;18:226. doi: 10.1186/s13075-016-1116-9

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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 — Association between systemic bone mineral density and anti-citrullinated protein antibodies and/or rheumatoid factor. Mean Z scores in the lumbar spine, vertebrae L1-L4 (a, c, e) and total hip (b, d, f) in subgroups of patients stratified according to anti-citrullinated protein antibody (ACPA) titres (a, b), rheumatoid factor (RF) titres (c, d) and the combination of ACPA and RF (e, f). *Significant differences (p <0.05)