. 2020 Feb 20;17(4):1366. doi: 10.3390/ijerph17041366
© 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 1.
Flow-chart of recruitment and participation.