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. 2021 Sep 25;37:100501. doi: 10.1016/j.epidem.2021.100501

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© 2021 The Authors

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Fig. 2 — The geographic locations of seven provinces/cities studied in the current research (colored in red). The maps are depicted based on the standard maps (GS(2019)1647,GS(2019)3333) from Standard Map Service (bzdt.ch.mnr.gov.cn) by Ministry of Natural Resources of the People’s Republic of China. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)