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. 2021 Sep 3;9:43. doi: 10.1186/s40635-021-00406-7

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© The Author(s) 2021

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/.

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Fig. 8 — ROC analysis for the differentiation between patients with viral COVID-19 or non-COVID-19 pneumonia (CAP) for progranulin vs. procalcitonin (PCT), interleukin-6 (IL-6) or C-reactive protein (CRP). Procalcitonin and C-reactive protein act as a negative predictor for the detection of a SARS-COV-2 pneumonia and have therefore been inverted for this ROC analysis