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. 2018 Feb 20;6:37. doi: 10.1186/s40168-018-0414-7

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Cohort composition. a The number of individuals included in the study from different countries; countries with less than 20 individuals participating are not shown. b Different body sites sampled as part of the study. c Age distribution of the individuals included in the study, color coded by country. For better visualization, values were binned with 2 years per bin

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