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. 2021 Oct 20;13:755160. doi: 10.3389/fnagi.2021.755160

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Copyright © 2021 Su, Ni, Cao, Wang, Shi and Tian.

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 summarizing the overall correlation between odor identification score and hippocampal volume across all studies and their 95% interval for each study. (Random effects model selected. NC, normal control; AD, Alzheimer's disease; MCI, mild cognitive impairment; D, hippocampal volume measurement in double sides; R, hippocampal volume measurement in right side; L, hippocampal volume measurement in left side).