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. 2018 Nov 20;9:917. doi: 10.3389/fneur.2018.00917

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Copyright © 2018 Chen, Qian, Gu and Wang.

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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The pooled relative risk of the short-term safety outcomes. The diamond indicates the estimated relative risk (95% confidence interval) for all patients.