*The Cardiology Division, Tangshan Workers' Hospital, Tangshan, China;

†The First Cardiology Division, the First Hospital of Hebei Medical University, Shijiazhuang, China; and

‡Hebei General Hospital, Shijiazhuang, China.

Correspondence: Chao Liu, MD, PhD, the First Cardiology Division, the First Hospital of Hebei Medical University, Hebei Medical University, Hebei, China (e-mail: [email protected]).

Supported by the National Natural Science Foundation of China No. 81670357.

The authors report no conflicts of interest.

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S. Li and Y. Huang contributed equally to the study.