*Department of Cardiology, Nanchong Central Hospital, Nanchong, China;

†The First Clinical Medical College of 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).

P. -Y. Zhong: research design, data collection, data analysis, and manuscript. Y. Ma: data collection, data analysis, and validation. Y. -S. Shang: data collection and validation. N. Bai: data collection and validation. Y. Niu: data collection and validation. Z. -L. Wang: scientific revision of the manuscript.