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. 2017 Jun 6;19:127. doi: 10.1186/s13075-017-1338-5

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© The Author(s). 2017

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. 3 — ANA staining patterns. Frequencies of patterns across all samples (a) and according to degree of positivity (b) (weak, 1:80 or 1:160; moderate, 1:320 or 1:640; strong, ≥1:1280). ANA anti-nuclear autoantibody