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. 2020 May 29;40(9):2213–2222. doi: 10.1007/s10792-020-01400-w

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Data Distribution. The distribution of the number of subjects (a) and SER (b) across ages. Boxplots show mean value (round dot), median (horizontal line), 25^th and 75th percentile, maximum and minimum values for each group. The mean values are connected to show the trend of SER change with development. No statistical significance is found in any of the age between genders (Student's t test). See statistics for comparison between each age group in Supplementary Table 5