. 2021 Feb 22;23(2):e23786. doi: 10.2196/23786
©Yanping Duan, Borui Shang, Wei Liang, Gaohui Du, Min Yang, Ryan E Rhodes. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 22.02.2021.
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Figure 2.
Risk of bias in individual studies (k = 15).