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. 2017 May 26;17:517. doi: 10.1186/s12889-017-4374-9

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© The Author(s). 2017

Open AccessThis 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 — Geographical distribution of the 15 sampling cities in Guangdong, 2015. Note: Cities labeled by consecutive numbers ranging from 2 to 15. 2 = Shenzhen; 3 = Dongguan; 4 = Foshan; 5 = Zhongshan; 6 = Huizhou; 7 = Jiangmen; 8 = Zhaoqing; 9 = Zhuhai; 10 = Jieyang; 11 = Shanwei; 12 = Meizhou; 13 = Zhanjiang; 14 = Yangjiang; 15 = Yunfu. The map is owned by the author