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. 2019 Jun 18;19:108. doi: 10.1186/s12890-019-0877-8

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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 — The diagnostic power of serum CRP, calprotectin, and NGAL for identifying CPPE and empyema. Diagnostic power of serum CRP combined with calprotectin (a) and serum CRP combined with NGAL (b) in CPPE and empyema