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. 2019 Jul 9;16(13):2430. doi: 10.3390/ijerph16132430

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© 2019 by the author.

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/).

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The maps present the location of study area. Original source files from: https://www.google.pl/maps/@52.0122001,29.5346949,3.17z/data=!5m1!1e4?hl=en; https://www.google.pl/maps/@50.3650717,18.80662,12z/data=!5m1!1e4?hl=enfgg [33,34].