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. 2021 Sep 27;8:641429. doi: 10.3389/fmed.2021.641429

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Copyright © 2021 Cao, Ming, Chen, Zhu and Shi.

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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Forest plot of mean difference (MD) of hospital stay among patients treated with convalescent blood products and controls (n = 6 studies). Weights are from fixed-effects analysis. CI, confidence interval.