1. The First Affiliated Hospital,Medical Imaging Centre,Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
2. Institute of Medical Imaging,Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
3. Laboratory of Ultrasound Molecular Imaging, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou 510000, Guangdong, China