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. 2019 Nov 21;14:27. doi: 10.1186/s12995-019-0248-7

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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. 2 — Network visualization map for country collaboration. The minimum number of documents of an author was 10. 80 countries meet this threshold as illustrated in 11 clusters. Countries represented with larger circle size or font size had relatively more publications