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. 2022 Feb 9;8:740559. doi: 10.3389/fmed.2021.740559

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Copyright © 2022 Mao, Yin, Cai, Niu, Xu, Sui 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 the pooled HR of all-cause mortality risk for SA (SA as four-category variable, measured by HAI: HAI 0-2 [healthy], HAI 3-4, HAI 5-6, HAI 7-10 [unhealthy], respectively. HAI 0-2 as the reference group).