1. Department of Cardiovascular Surgery; The First Affiliated Hospital of Harbin Medical University, Harbin; Heilongjiang 150001 The People's Republic of China
2. Department of Cardiology; The First Affiliated Hospital of Harbin Medical University, Harbin; Heilongjiang 150001 The People's Republic of China
3. Department of Computer Tomography; The First Affiliated Hospital of Harbin Medical University, Harbin; Heilongjiang 150001 The People's Republic of China