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. 2021 Jan 24;94(5):935–944. doi: 10.1007/s00420-021-01651-9

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© The Author(s) 2021

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 — Distribution of mercury concentrations (µg/g creatinine) in urine samples of recycling workers from five german e-waste recycling sheltered workshops (facilities A–E). The boxplot is divided by the median. The box contains the middle 50% of the distribution (interquartile range) and the whiskers show 25% each. Outliers are shown separately. No further statistical test were conducted due to the limited number of samples