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.