1. Department of Ultrasound, Tongde Hospital of Zhejiang Province, Hangzhou 310012, P. R. China
2. Second Affiliated Hospital of Chongqing Medical University & Chongqing Key Laboratory of Ultrasound Molecular Imaging, Chongqing 400010, P. R. China
3. Shanghai Institute of Ultrasound in Medicine, Shanghai Jiaotong University Affiliated Shanghai Sixth People’s Hospital, Shanghai 200233, P. R. China
4. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China