. 2019 Sep 6;16(18):3276. doi: 10.3390/ijerph16183276
© 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 1.
Sample definition, Madrid Health Survey 2017.