Statement of Ethics
Since this study did not involve operations such as drugs that may affect the human body and ultrasonography is a non-invasive test, we followed the principles of the Declaration of Helsinki, and the echocardiography and clinically relevant data were collected after informed consent of patients.
Author Contributions
You Yang and Biaohu Liu made significant contributions to the design, data acquisition, statistical analysis and data interpretation. You Yang drafted this study and completed the manuscript. And further improved and revised the article under the guidance of Biaohu Liu. Biaohu Liu and Deguo Wang made significant contributions to the funds collection of the study. Jing Ding, Shanqiang Tao and Feifei Lian contributed to data acquisition and statistical analysis. Wenyan Ji made significant contributions to the literature search and revision of the important content of this study.