1. Department of Hepatobiliary Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550001, P.R. China
2. Clinical Research Center, The Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550001, P.R. China
3. Clinical Medical College, Guizhou Medical University, Guiyang, Guizhou 550001, P.R. China