Jingzhi Cai1, Wengang Guo1, Chuangye He1, Guohong Han2. 1. Department of Liver Disease and Digestive Interventional Radiology, Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China. 2. Department of Liver Disease and Digestive Interventional Radiology, Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China. Electronic address: hangh@fmmu.edu.cn.