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. 2019 Dec 21;15:463. doi: 10.1186/s12917-019-2176-2

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — The map of sampling location in Khorasan Razavi province, Iran. The sources of the map of Khorasan province was from the our previous study at http://ijpa.tums.ac.ir/index.php/ijpa/article/view/284 and the map of Iran at http://en.wikipedia.org/wiki/File:Locator_map_Iran_Razavi_Khorasan