1. Vaccine Research Center, Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Science, Shanghai, China
2. Institute of Biology and Medical Sciences, Soochow University, Suzhou, China
3. Department of Laboratory Medicine, Ren Ji Hospital School of Medicine, Shanghai Jiao Tong University, Shanghai, China
4. Department of Animal Centre, Ren Ji Hospital School of Medicine, Shanghai Jiao Tong University, Shanghai, China
5. The Wistar Institute, Philadelphia, Pennsylvania, USA