. 2020 Oct 23;8(10):e18426. doi: 10.2196/18426
©Fangfang Cui, Qianqian Ma, Xianying He, Yunkai Zhai, Jie Zhao, Baozhan Chen, Dongxu Sun, Jinming Shi, Mingbo Cao, Zhenbo Wang. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 23.10.2020.
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Figure 1.
Distribution of the survey coverage areas in China.