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Statistical analysis<br />

Continuous variab<strong>le</strong>s were described as their mean and standard deviation (SD) or<br />

median value and range; categorical variab<strong>le</strong>s were described as percentages.<br />

Comparisons between patients with discordant and non discordant results were performed<br />

by a Mann-Whitney test for quantitative variab<strong>le</strong>s, and by a Chi-2 or Fischer exact test for<br />

qualitative variab<strong>le</strong>s. A p value

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