1 Department of Cardiology, the Second Affiliated Hospital of Harbin Medical University, Harbin, China; Key Laboratory of Myocardial Ischemia, Ministry Education, Harbin Medical University, Harbin, China.
2 Department of Cardiology, the Second Affiliated Hospital of Harbin Medical University, Harbin, China; Key Laboratory of Myocardial Ischemia, Ministry Education, Harbin Medical University, Harbin, China. Electronic address: wubingxiang1964@163.com.