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. 2021 May 14;68:102750. doi: 10.1016/j.bspc.2021.102750

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Fig. 6 — Histograms of the most frequent visual words for (a) two overlapped histograms of inside of the lungs, and (b) outside regions of lungs. Visual words from COVID-19 images shown by red, and non-COVID-19 by blue.