Rui-Qi Zou1, Hai-Jie Hu2, Fu-Yu Li3. 1. Department of Biliary Surgery, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China. . 497138511@qq.com. 2. Department of Biliary Surgery, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China. hhj1063557621@163.com. 3. Department of Biliary Surgery, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China. lfy_74@hotmail.com.