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. 2020 Oct 14;15:285. doi: 10.1186/s13023-020-01567-6

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Histopathology results of IgG4-RD, RDD mimic IgG4-RD and RDD patients. RDD total includes all the patients in RDD group and RDD mimic IgG4-RD group. Chi square test was performed between RDD total group and IgG4-RD group. a In RDD total group and IgG4-RD group, patients that have a histopathology result with different numbers of IgG4+ plasma cells/hpf are represented with colors of different grey levels. 4 colors from dark to light: percentage of patients with a histopathology result of > 100 IgG4+ plasma cells/hpf; > 50 and ≤ 100 IgG4+ plasma cells/hpf; > 10 and ≤ 50 IgG4+ plasma cells/hpf; ≤ 10 IgG4+ plasma cells/hpf. b In RDD total group and IgG4-RD group, patients with different ratios of IgG4/IgG in tissue in histopathology analysis are represented with colors of different grey levels. 3 colors from dark to light: percentage of patients with a ratio of IgG4/IgG > 40; with a ratio of IgG4/IgG > 10 and ≤ 40; with a ratio of IgG4/IgG ≤ 10.