1. School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510006, China
2. Laboratory of Ultrasound Molecular Imaging, Department of Ultrasound Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510150, PR China
3. Laboratory of Ultrasound Molecular Imaging, Department of Ultrasound Medicine, The Liwan Hospital of the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510150, PR China