. 2020 Dec 24;11(1):15. doi: 10.3390/brainsci11010015
© 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/).
Figure 2.
Sample size of studies included in the review.