Correction to: Neurological Sciences (2019)
10.1007/s10072-019-04144-3
The originally published version of this article contained typesetting errors in Figure 4. The figure has a wrong reference for Ma et al. It should be 33 rather than 3. The correct figure is presented here. The original article has been corrected.
Fig. 4.
Risk of bias for systemic review studies
Footnotes
The online version of the original article can be found at 10.1007/s10072-019-04144-3
Contributor Information
Thang S. Han, Email: thang.han@rhul.ac.uk
Pankaj Sharma, Email: pankaj.sharma@rhul.ac.uk.

