Danli Sheng1,2, Liming Deng1, Pan Li1, Zhigang Wang1 and Qunxia Zhang1,*
重庆医科大学附属第二医院张群霞副主任医师
1 Institute of Ultrasound Imaging, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P. R. China
2 Department of Ultrasound, Fudan University, Shanghai Cancer Center, Shanghai 200032, China