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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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(A) Levels of κ and λ serum free light chains were different between IgG4-related disease patients with (n = 11) compare to those without (n = 34) renal involvement (median with interquantile range). Statistics performed by Mann–Whitney U test. (B) The receiver operating characteristic curve for κ and λ serum free light chains distinguished patients with renal involvement from patients without. sFLC serum free light chains, PPV positive predictive value, NPV negative predictive value, PLR positive likelihood ratio, NLR negative likelihood ratio.