1. Department of Ultrasound in Medicine, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou310009, P. R. China
2. Research Center of Ultrasound in Medicine and Biomedical Engineering, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou310009, P. R. China
3. Research Center for Life Science and Human Health, Binjiang Institute of Zhejiang University, Hangzhou310009, P. R. China