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. 2020 Aug 20;10(3):832–847. doi: 10.3390/ejihpe10030060

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© 2020 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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Diachronic evolution of production (a), the countries with the highest production (b), the most productive authors (c) and main areas of research (d). General categories in Web of Science (WOS) (e), most productive countries (f), most productive sources (g), sources with high impact based on H index (h) and most cited papers (i).

Diachronic evolution of production (a), the countries with the highest production (b), the most productive authors (c) and main areas of research (d). General categories in Web of Science (WOS) (e), most productive countries (f), most productive sources (g), sources with high impact based on H index (h) and most cited papers (i).