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. 2020 May 29;20:486. doi: 10.1186/s12885-020-06974-3

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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. 3 — The keywords co-occurrence network. Minimum number of occurrence of a keyword = 10, minimum links strength = 10. Overall, 1638 keywords met threshold criteria. There are 7 clusters of keywords: red indicates Cluster 1 (n = 449), green indicates Cluster 2 (n = 341), blue indicates Cluster 3 (n = 285), yellow indicates Cluster 4 (n = 246), purple indicates Cluster 5 (n = 214), light-blue indicates Cluster 6 (n = 94), orange indicates Cluster 7 (n = 9)