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. 2019 Jul 17;9:33. doi: 10.1186/s13601-019-0275-6

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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. 1 — Serum levels of PAF (a) and PAF-AH (b) and PAF-AH to PAF ratio (c) in patients with CSU and NCs. PAF platelet activating factor, PAF-AH platelet activating factor acetylhydrolase, CSU chronic spontaneous urticaria, NC healthy normal control. p values were calculated by Mann–Whitney U-test