1. Department of Ultrasound Chongqing Key Laboratory of Ultrasound Molecular Imaging The Second Affiliated Hospital of Chongqing Medical University Chongqing 400010 P. R. China
2. Department of Cardiology The First Affiliated Hospital Cardiovascular Institute Harbin Medical University Harbin 150001 P. R. China
3. State Key Laboratory of Ultrasound in Medicine and Engineering The Second Affiliated Hospital of Chongqing Medical University Chongqing 400010 P. R. China
4. Department of Radiology Chongqing General Hospital University of Chinese Academy of Sciences Chongqing 400014 P. R. China
5. Department of Ultrasound The First Affiliated Hospital of Harbin Medical University Harbin 150001 P. R. China