. 2020 Oct 18;17(20):7574. doi: 10.3390/ijerph17207574
© 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 9.
Citation network of subclusters in group 1.