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. 2021 Jun 3;12:669000. doi: 10.3389/fpsyg.2021.669000

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Copyright © 2021 Zhou, Zhu, Shi, Yuan, Yao, Chu, Shi, Jia, Chen and Hu.

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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The analysis of keywords relating to the research about CHD and depression or anxiety from 2004 to 2020. The larger the cross is, the higher frequency each keyword has. The frequency of the top keywords is listed in Table 6.