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Some examples of (a) COVID-19, (b) influenza-A (H1N1), and (c) CAP cases in chest CT images. The red arrows indicate the locations of the main lesion regions. It can be seen that there are similar lesions among different types of pneumonia, which increases the challenge for the accurate diagnosis of COVID-19. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
