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. 2019 Sep 18;10:14. doi: 10.1186/s13326-019-0207-3

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© The Author(s). 2019

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 — A representation of a unqualified relationship between Non-small cell lung cancer and Recurrent (1) and an attribute relationship of Non-small cell lung cancer with Recurrent as Clinical course (2). The attribute relationship is modelled as a SNOMED CT concept definition diagram of recurrent non-small cell lung cancer (a new post-coordinated expression). Purple blocks represent defined concepts, blue blocks represent primitive SNOMED CT concepts and yellow blocks represent attributes. Attribute groups are represented using a white circle, and conjunctions are represented using a black dot