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. 2021 Jun 24;11(7):1155. doi: 10.3390/diagnostics11071155

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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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(A–F) subfigures show the progression of a US image for a COVID-19 patient across days (1, 3, 6, 7, 8, and 10, respectively). The white arrows in each subfigure clarify the change in each day.