1. Department of Ultrasound, West China Hospital of Sichuan University, No. 37 Guo Xue Xiang, Chengdu, Sichuan 610041, P.R. China
2. Department of Ultrasound, Sichuan Academy of Medical Science & Sichuan Provincial People’s Hospital, No. 32 Yi Huan Lu Xi Er Duan, Chengdu, Sichuan 610041, P.R. China
3. Department of Biomedical Engineering, Sichuan University, Wangjiang Campus, No. 11 Yi Huan Lu Nan San Duan, Chengdu, Sichuan 610041, P.R. China
4. Department of Pathology, West China Hospital of Sichuan University, No. 37 Guo Xue Xiang, Chengdu, Sichuan 610041, P.R. China