. 2021 Feb 9;9(2):e23338. doi: 10.2196/23338
©Jing Li, Dong Wei, Shuyi Liu, Mingxia Li, Xi Chen, Li Chen, Yuelei Wu, Wen Zhou, Lingyun Ouyang, Cuixia Tan, Hongdao Meng, Nanwei Tong. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 09.02.2021.
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Figure 1.
Study flow diagram.