1. Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing 100050, China
2. Department of Biomedical Engineering, College of Future Technology, National Biomedical Imaging Center, Peking University, Beijing 100871, China
3. Cancer Hospital Chinese Academy of Medical Sciences, No.17, Panjiayuan Nanli, Chaoyang
District, Beijing 100021, China