Chao Sun1 Qian Wang1 Lu Hou2 Rui Zhang1 Yu Chen1* Lijuan Niu1* 1Department of Ultrasound, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China 2Department of Radiotherapy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China Background: There is no study focusing...