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. 2019 Apr 11;10:6. doi: 10.1186/s13326-019-0198-0

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© The Author(s) 2019

Open Access This 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. 4 — Word-level grammar rule mapping phrases to normalizing constant “:SPOUSE:”. Note that these rules were defined for the US healthcare system and hence may not prove appropriate for non-US contexts