1. Department of Hepatobiliary Surgery, The Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China
2. Department of Surgery, Guizhou Medical University, Guiyang, China
3. College of Clinical Medicine, Guizhou Medical University, Guiyang, China
4. Guizhou Provincial Institute of Hepatobiliary, Pancreatic and Splenic Diseases, Guiyang, China