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. 2016 Feb 25;6:21850. doi: 10.1038/srep21850

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Hair zinc concentrations for 28,424 subjects are shown in the log plot. The numbers on the abscissa indicate the log of hair zinc concentrations (ng/g hair: ppb). The height of each rectangle represents the frequency in the respective class interval of the log of hair zinc concentration. The dotted vertical line represents the −2 S.D. (standard deviation) level of the control reference range for hair zinc concentrations.