1. State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. School of Physical Science and TechnologyShanghaiTech University Shanghai 201210 P. R. China
4. Department of UltrasoundFudan University Shanghai Cancer Center Shanghai 200032 P. R. China
5. Department of Oncology, Shanghai Medical CollegeFudan University Shanghai 200032 P. R. China