1 Department of Hepatobiliary Surgery, the Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, Jiangsu, China.
2 Department of Hepatobiliary Surgery, the Affiliated Drum Tower Hospital, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.
3 Department of Hepatobiliary Surgery, the Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, Jiangsu, China yudecai@nju.edu.cn.