1. Department of Infectious Diseases; The First Affiliated Hospital with Nanjing Medical University; Nanjing, PR China
2. China-US Vaccine Research Center; The First Affiliated Hospital with Nanjing Medical University; Nanjing, PR China
3. State Key Laboratory of Pathogen and Biosecurity; Beijing Institute of Microbiology and Epidemiology; Beijing, PR China
4. Laboratory of Nucleic Acid Vaccines; Department of Medicine; University of Massachusetts Medical School; Worcester, MA USA