1. Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Xi-Cheng, Beijing 100050, People's Republic of China
2. Department of Liver Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Wangfujing, Beijing 100730, People's Republic of China
3. Department of Interventional Radiology, Beijing Friendship Hospital, Capital Medical University, Xi-Cheng, Beijing 100050, People's Republic of China