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. 2021 Sep 30;18(19):10326. doi: 10.3390/ijerph181910326

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Overlay visualization of co-occurrences by author keywords of records in G1. Diverse colours represent diverse years of publication. Cluster analysis and graphic representation were made using VOSviewer software. C: cluster.