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. 2022 May 26;13:220. doi: 10.1186/s13287-022-02900-5

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© The Author(s) 2022

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/. 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 in a credit line to the data.

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Fig. 2 — Clinical improvement from baseline, the onset day of inhalation treatment, in individual patients in the MEXCOVID study. A Changes in oxygen-support status from baseline in individual patients. B Cumulative incidence of clinical improvement from the onset of neublization. C–F Changes of chest CT scan before and after haMSC-Exos inhalation in COVID-19 patients