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. 2015 May 20;5:10075. doi: 10.1038/srep10075

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. (a) Probability density function of . (b) – (d) Probability density function of according to the gender (b) the age (c) and the occupation (d) The insets show the Tukey boxplot of the distributions, the black points represent the average.

Inline graphic — . (a) Probability density function of . (b) – (d) Probability density function of according to the gender (b) the age (c) and the occupation (d) The insets show the Tukey boxplot of the distributions, the black points represent the average.