. 2021 Feb 17;57(2):172. doi: 10.3390/medicina57020172
© 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/).
Figure 4.
Year of first publication from the journals.