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. 2021 Jan 5;23(1):e21542. doi: 10.2196/21542

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©Su-Hang Xie, Qian Wang, Li-Qiong Wang, Lin Wang, Kang-Ping Song, Cheng-Qi He. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 05.01.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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PRISMA (Preferred Reporting Items for Systematic reviews and Meta-Analyses) flow diagram. CENTRAL: Cochrane Central Register of Controlled Trials; EMBASE: Excerpta Medica Database; MEDLINE: Medical Literature Analysis and Retrieval System Online; PEDro: Physiotherapy Evidence Database; CNKI: China National Knowledge Infrastructure.