1. State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wu Chang District, Wuhan 430071, China.
2. State Key Laboratory for Infectious Diseases Prevention and Control, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Xuan Wu District, Beijing 100050, China.
3. Graduate School of the Chinese Academy of Sciences, Shi Jing Shan District, Beijing 100049, China.
4. Vaccine Research Center, NIAIDS, NIH, Bethesda, Maryland.