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. 2021 Oct 28;13:746797. doi: 10.3389/fnagi.2021.746797

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Copyright © 2021 Liu, Liu, Liu, Rao, Wang, Wang, Gong and Wen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flow diagram for the selection of the included studies. CBM, China Biology Medicine; CNKI, China National Knowledge Infrastructure; RCTs, randomized controlled trials; tDCS, transcranial direct current stimulation; VIP, China Science and Technology Journal Database.