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Examples of LUS images from (a) moderate case, (b) severe case, and (c) critical case. Green thick arrow and thin arrow in (a) indicate a normal PL and a single BL, respectively. Red thick arrow and thin arrow in (b) indicate the thickened and irregular PL and the confluent BLs, respectively. Yellow thick arrow and thin arrow in (c) indicate the interrupted PL and the confluent BLs, respectively.
