. 2019 Jul 25;16(15):2668. doi: 10.3390/ijerph16152668
© 2019 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.
Eggers regression test to test hypothesis 2.