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FIG 2. Graph (box plots) shows primary tumor volumes of oral and maxillary sinus (A) and pharyngeal (B) cancers categorized at T1–T4. The horizontal line is a median (50th percentile) of the measured volumes, the top and bottom of the boxes represent 25th and 75th percentiles, respectively, and whiskers indicate the range from the largest to smallest observed data points within 1.5 interquartile range presented by the box. P, Mann-Whitney U test.
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