1. Department of Medicine Ultrasonics, Nanfang Hospital, Southern Medical University, Guangzhou 510515, P. R. China
2. Guangdong Provincial Key Laboratory of Tumor Immunotherapy, Guangzhou Key Laboratory of Tumor Immunology Research, Cancer Research Institute, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, P. R. China
3. Department of Oncology, Kiang Wu Hospital, Macau 999078, P. R. China
4. The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518033, P. R. China