1. Second Affiliated Hospital
2. Institute of Ultrasound Imaging
3. Chongqing Medical University
4. Chongqing 400010
5. P.R. China
6. Department of Ultrasound
7. Renmin Hospital of Wuhan University
8. Wuhan
9. Department of Interventional Ultrasound
10. Chinese PLA General Hospital
11. Beijing
12. P. R. China
13. Central Hospital of Wuhan
14. Tongji Medical College Huazhong University of Science&technology
15. Chongqing Cancer Institute & Hospital & Cancer
16. Chongqing 400030
17. the First Affiliated Hospitalof Nanjing Medical University
18. Nanjing
19. Zhongda Hospital
20. Southeast University
21. Nanjing 210009