Department of Hepatobiliary Surgery First Affiliated Hospital of Xi''an Jiaotong University Xi''an Shaanxi 710061 China;
Department of General Surgery First Affiliated Hospital of Xinjiang Medical University Urumqi Xinjiang 830054 China;
Department of Hepatobiliary Surgery Second Affiliated Hospital of Lanzhou University Lanzhou Gansu 730030 China;
Department of Hepatobiliary Surgery Lanzhou General Hospital of Lanzhou Military Region Lanzhou Gansu 730050 China;
Department of Hepatobiliary Surgery General Hospital of Ningxia Medical University Yinchuan Ningxia 750004 China;
Department of Hepatobiliary Surgery Affiliated Hospital of Qinghai University Xining Qinghai 810001 China;
Faculty of Public Health School of Medicine Xi''an Jiaotong University Xi''an Shaanxi 710061 China;
Department of Pathology First Affiliated Hospital of Xi''an Jiaotong University Xi''an Shaanxi 710061 China;
Department of General Surgery Second Affiliated Hospital of Xi''an Jiaotong University Xi''an Shaanxi 710004 China;
[10]Department of Hepatobiliary Surgery Shaanxi People''s Hospital Xi''an Shaanxi 710068 China;
[11]Department of Hepatobiliary Surgery Shaanxi Nuclear Industry 215 Hospital Xianyang Shaanxi 712000 China;