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. 2017 Jun 6;7(5):e014821. doi: 10.1136/bmjopen-2016-014821

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Repeated measures plot of first and last chromium level in those patients who had repeated levels. Chromium levels (μg/L) were not normally distributed. The median chromium level did not change from 0.44 µg/L and the rise in the values was not statistically significant (p=0.3381, Wilcoxon matched-pairs signed-rank test).