1. Beijing Genomics Institute, Chinese Academy of Sciences, People's Republic of China
2. Institute of Microbiology and Epidemiology, Academy of Military Medicine, People's Republic of China
3. Chinese National Vaccine and Serum Institute, People's Republic of China
4. College of Life Science, Hunan Normal University, People's Republic of China
5. Wuhan Institute of Virology, Chinese Academy of Sciences, People's Republic of China; and College of Life Science, Hunan Normal University, People's Republic of China