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. 2020 May 8;16:44. doi: 10.1186/s12992-020-00576-1

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© The Author(s) 2020

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

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Fig. 4 — Network visualization map of international research collaboration among top 20 active countries in the health-related literature. The thickness of the connecting line (link strength) is proportional to the extent of research collaboration between the connected countries. Node size of each country represents the percentage of documents with international researchers. Larger node size is indicative of greater international research collaboration for that country. Similar color indicates close research interest. The map was created by VOSviewer