1. Department of Hepatobiliary Surgery, Guilin Medical University, Guilin 541001, Guangxi, P.R. China
2. Department of Medical Oncology, Affiliated Hospital, Guilin Medical University, Guilin 541001, Guangxi, P.R. China;
3. Department of Microbiology and Immunology, Darby Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425, USA