. 2021 Mar 18;9(3):e18763. doi: 10.2196/18763
©Xianzuo Zhang, Xiaoxuan Chen, Nikolaos Kourkoumelis, Ran Gao, Guoyuan Li, Chen Zhu. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 18.03.2021.
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Figure 2.
Flowchart of participation.