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. 2019 Mar 14;8(3):360. doi: 10.3390/jcm8030360

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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The co-occurrence of authors’ keywords. Figure 6 presents the prevalence of 568 keywords appearing in our search results using the Web of Science. The thickness of lines is an indication of the strength of the relationship between keywords relative to the others. The strength of these relationships was determined by the frequency with which they appeared together in published articles. Their inclusion into specific thematic groups was based on their clustering with a certain constellation of terms. The position of a keyword within this constellation represents how interrelated and frequent its co-occurrence was with other terms.