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. 2021 Jan 22;18(3):952. doi: 10.3390/ijerph18030952

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

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Thematic network structure of the strategic research themes of COVID-19 in 2020. (a) The cluster ‘CHLOROQUINE’. (b) The cluster ‘ANXIETY’. (c) The cluster ‘ACUTE-RESPIARTORY-SYNDROME’. (d) The cluster ‘INFECTIOUS-DISEASE(S)’. (e) The cluster ‘PERSONAL PROTECTIVE-EQUIPMENT’. (f) The cluster ‘HYPERTENSION’ (g) The cluster ‘PREGNANCY’. (h) The cluster ‘COMPUTED-TOMOGRAPHY’. (i) The cluster ‘VACCINE’ (j) The cluster ‘ONCOLOGY’. (k) The cluster ‘PULMONARY-EMBOLISM’. (l) The cluster ‘ARTIFICIAL-INTELLIGENCE’.