1. Department of Gastrointestinal Surgery, Affiliated Hospital of Guilin Medical University, Guilin 541001, P. R. China
2. School of Bioengineering, Dalian University of Technology, Liaoning, Dalian 116024, P. R. China
3. Dalian SEM Bioengineer and Biotech Co. Ltd., Dalian 116620, P. R. China
4. Key Laboratory of Tumor Immunology and Microenvironmental Regulation, Guilin Medical University, Guilin 541199, P. R. China