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. 2021 Jan 19;11:1832. doi: 10.1038/s41598-021-81321-5

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© The Author(s) 2021, corrected publication 2021

Open Access This 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/.

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Relationship between κ and λ serum free light chains and the κ/λ ratio and serological parameters in the IgG4-RD patients (n = 45). (A) Correlation between serum IgG1 levels and the levels of κ and λ serum free light chains and the κ/λ ratio. (B) Correlation between serum IgG4 and the levels of κ and λ serum free light chains and the κ/λ ratio. All correlations were determined using Spearman’s test.