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. 2022 Feb 2;13:20406223211069198. doi: 10.1177/20406223211069198

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© The Author(s), 2022

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Effects of tDCS on fatigue in MS: (a) a forest plot showing studies that compare anodal tDCS with sham stimulation for fatigue symptoms on MS. (b) Examination of bias. The figure depicts an asymmetric funnel plot (p < 0.001). Possible sources of asymmetry are publication bias, poor methodological quality, true heterogeneity, and chance.