. 2020 Jan 23;8(1):e17055. doi: 10.2196/17055
©Caiyun Zheng, Xu Chen, Lizhu Weng, Ling Guo, Haiting Xu, Meimei Lin, Yan Xue, Xiuqin Lin, Aiqin Yang, Lili Yu, Zenggui Xue, Jing Yang. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 23.01.2020.
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Figure 1.
Literature screening and selection flow chart.