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. 2021 Aug 24;13(9):1675. doi: 10.3390/v13091675

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Study flowchart. white blood cell (WBC); Regional General Hospital l (HGR-1); General Hospital of Area 83 (HGZ-83); online notification system for epidemiological surveillance (SINOLAVE); neutrophil-to-lymphocyte ratio (NLR).