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. 2021 Oct 20;12:746276. doi: 10.3389/fpsyt.2021.746276

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Copyright © 2021 Liu, Tan, Liu, Wang, Hua and Qian.

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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Mendelian randomization (MR) plots for relationship of critically ill COVID-19 with schizophrenia. (A) Scatter plot of single-nucleotide polymorphism (SNP) effects on critically ill COVID-19 vs. their effects on schizophrenia. The slope of each line indicated MR effect of every method. (B) Forest plot of causal effect size of each SNP on total schizophrenia risk.