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The urinary VOC profiles using 2 mL (red) and 10 mL (blue) vials (n = 15). 0.5 mL urine was treated with 0.1 mL 5 M H2SO4, to yield 0.83 M final solution, pH 0.075. (a) Paired boxplot to show the cumulative unique number of VOCs produced per sample for either vial volume. (b) Venn diagram showing the unique VOCs detected in each vial volume.
