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. 2020 Nov 4;51(5):2740–2763. doi: 10.1007/s10489-020-02019-1

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© Springer Science+Business Media, LLC, part of Springer Nature 2020

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 1 — a) X-ray image of a patient with Covid-19 (Phan et al. [23]) b) Non-Covid-19 X-ray image (Montgomery data set [44])) c) Non-Covid-19 X-ray image (Shenzhen data set [44]))