*The First Clinical Medical College, Lanzhou University, Lanzhou, China; and

†Department of Cardiology, The First Hospital of Lanzhou University, Lanzhou, China.

Correspondence: Zhi-Lu Wang, MD, Department of Cardiology, The First Hospital of Lanzhou University, No. 1, Donggang West Rd, Chengguan District, Lanzhou, Gansu 730000, China (e-mail: [email protected]).

The authors report no conflicts of interest.

Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (www.jcvp.org).

N. Bai contributed to the study's conception and design. Material preparation, data collection, and analysis were performed by N. Bai, Y. Niu, Y. Ma, Y.-S. Shang, and P.-Y. Zhong. The first draft of the manuscript was written by N. Bai and a scientific revision of the manuscript was performed by Z.-L. Wang. All authors read and approved the final manuscript.

Data sharing was not applicable to this article as no datasets were generated or analyzed during the current study.