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. 2021 Apr 1;1(1):e2. doi: 10.52225/narraj.v1i1.2

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© 2021 The Author(s).

This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY NC 4.0), which permits copying, adaptation and redistribution, provided the original work is properly cited (https://creativecommons.org/licenses/by-nc/4.0/).

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Figure 1. — Co-authorship country visualization mapping based on total link strength (TLS). Of the total countries, only 10 countries formed 4 clusters and each color represents different cluster; red represents cluster 1 (Canada, Germany, USA), green color represents cluster 2 (France, Japan, Sweden), blue color represents cluster 2 (Belgium, Netherlands), and yellow color represents cluster 4 (Austria, England).