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. 2018 Mar 23;20:59. doi: 10.1186/s13075-018-1533-z

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© The Author(s). 2018

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. 1 — Anti-PAD4 antibody units in patients with positive tests by smoking status. Anti-PAD4 antibody units for the 68 anti-PAD4 positive patients, grouped by smoking history, are shown. The median anti-PAD4 level, interquartile range, and outliers are indicated in box plots for never (n = 40), former (n = 25), and current smokers (n = 3)