. 2020 May 29;17(11):3869. doi: 10.3390/ijerph17113869
© 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.
The algorithm of the final data collection.