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Examples of (a) horizontal A-lines (yellow arrows) in a normal lung, (b) multiple B-lines (yellow arrows) with an irregular pleura line (red arrows) in a COVID-19 indicative lung, and (c) white lung (completely diffused B-lines) for severe COVID-19 pneumonia. Reprinted with permission from ref. [34,51]. Copyright 2020 John Wiley and Sons.
