1. Institute of Health Service and Transfusion Medicine Beijing 100850 P. R. China
2. State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and Epidemiology Academy of Military Medical Sciences Beijing 100071 China
3. BGI college Zhengzhou University Henan Institute of Medical and Pharmaceutical Science Zhengzhou University Zhengzhou 450001 P. R. China
4. Cold Spring Biotech Corporation Beijing 110000 P. R. China