1. Department of Ultrasonography, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
2. Department of Interventional and Vascular Surgery, Tenth People's Hospital of Tongji University, Shanghai 200072, P.R. China
3. Department of Interventional Radiology, Affiliated Hospital of NanTong University, Nantong, Jiangsu 226001, P.R. China