. 2021 May 10;9(5):557. doi: 10.3390/healthcare9050557
© 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/).
Figure 1.
Flowchart of the study selection process.