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. 2017 Jul 20;7:5994. doi: 10.1038/s41598-017-05778-z

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© The Author(s) 2017

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Comparison of disease frequency for the ‘adult’ age bracket (40–60 years old). The y-axis shows the number of identified diseases in the emergency department data. The x-axis records the expected frequency of diseases according to the Google health knowledge graph for the ‘adult’ age bracket. The points highlighted demonstrate instances of frequency misalignment due to the differences in populations considered.