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. 2020 Dec 8;11:606521. doi: 10.3389/fneur.2020.606521

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Copyright © 2020 Sharobeam, Churilov, Parsons, Donnan, Davis and Yan.

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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Search strategy for meta-analysis. Full text articles analyzed, may have more than one reason for exclusion. Eighteen articles were included, with four excluded from the meta-analysis due to analysis of volume only.