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. 2020 Nov 11;11:557333. doi: 10.3389/fendo.2020.557333

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Copyright © 2020 Yifan and Jun

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-chart of the literature search and selection strategy in this meta-analysis. After applying the inclusion and exclusion criteria, a total of 4 studies were included in the final pooled analysis.