Contribution
Greatly appreciated for the supports from Prof. Li, who obtained the 2D
echocardiographic images, and participated in the analysis,
interpretation and statistics of date with me, as well as critical
revision. Xiuxiu Cui and Huaying Bo contributed equally to this article.
Also thanks for the help of Dong Yu, MD, Ying Wang, MD, Ying Li, MD,
Wenxing Chang, MD, Tingting, Yu, MD, approval of the article. Those
authors are all from Department of Ultrasound, the Second Affiliated
Hospital of Dalian Medical University, Dalian, China.