1. Department
of Medical Ultrasound, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, 301 Yan-chang-zhong Road, Shanghai 200072, P. R. China
2. Ultrasound
Research and Education Institute, Tongji University School of Medicine, 301 Yan-chang-zhong Road, Shanghai 200072, P. R. China
3. State
Key Laboratory of High Performance Ceramic and Superfine Microstructures,
Shanghai Institute of Ceramics, Chinese Academy of Science, 1295
Ding-Xi Road, Shanghai 200050, P. R. China