1 Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China.
2 Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute of Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan 430060, PR China.
3 Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China. Electronic address: yangjun@ctgu.edu.cn.