1. National Engineering Laboratory for AIDS Vaccine School of Life Sciences Jilin University Changchun 130012 China
2. State Key Laboratory of Respiratory Disease Guangzhou Institutes of Biomedicine and Health (GIBH) Chinese Academy of Sciences Guangzhou 510530 China
3. University of Chinese Academy of Sciences Beijing 100049 China
4. Department of Medicine Duke University Medical Center Durham NC 27710 USA
5. Key Laboratory for Molecular Enzymology and Engineering, The Ministry of Education, School of Life Sciences, Jilin University Changchun 130012 China
6. The First Affiliated Hospital of Guangzhou Medical University Guangzhou 510060 China