1. School of Public Health (Shenzhen), Sun Yat-sen University, Guangdong, People’s Republic of China
2. National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Reference and Research on Influenza; Key Laboratory for Medical Virology, National Health and Family Planning Commission, Beijing, People’s Republic of China
3. Institute of Pathogen Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, People’s Republic of China