1. Department of Ultrasound, Affiliated Tumor Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
2. Department of Hepatobiliary Surgery, Affiliated Tumor Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
3. Department of Ultrasound, The First People's Hospital of Nanning, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
4. Department of Ultrasound, Affiliated Tumor Hospital of Guangxi Medical University, Guangxi Zhuang Autonomous Region 530021, P.R. China