1. Department of Oncology, The First Hospital of Lanzhou University, Lanzhou, China
2. Department of the First Clinical Medical College of Lanzhou University, Lanzhou, China
3. Department of Oncology, Tumor Hospital of Gansu Province, Lanzhou, China
4. Department of Oncology Surgery, The First Hospital of Lanzhou University, Lanzhou, China
5. Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, USA
6. Institute of Pathogenic Biology, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China