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Box and whisker plots displaying the endothelial cell density (ECD) changes in the conventional US mode group (A) (P < .001) and the torsional mode group (B) (P < .001). The horizontal line in boxes represents the median; the box height indicates the interquartile range; whiskers represent the range of the assessed values preop = preoperative, postop4 = 4 weeks postoperative, postop8 = 8 weeks postoperative
