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. 2019 Dec 16;19:1218. doi: 10.1186/s12885-019-6439-x

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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 — Map of Huaian area, Jiangsu Province, China. Circled with arrow indicate the townships where the study participants were recruited for this case-control study. Map of Huaian was traced using Adobe Photoshop CS2 (https://www.adobe.com/), with texts and indicators added with Microsoft PowerPoint (https://www.microsoft.com/en-us/). No copyright issue present