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World Health Organization Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Gakuen 4-7-1, Musashimurayama, Tokyo 208-0011, Japan
World Health Organization Collaborating Centre for the Surveillance, Epidemiology and Control of Influenza, Centers for Disease Control and Prevention, 1600 Clifton RD NE, MS-G16 Atlanta, GA, United States
World Health Organization Collaborating Centre for the Surveillance, Epidemiology and Control of Influenza, Centers for Disease Control and Prevention, 1600 Clifton RD NE, MS-G16 Atlanta, GA, United States
World Health Organization Collaborating Centre for Reference and Research on Influenza, MRC-National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
World Health Organization Collaborating Centre for Reference and Research on Influenza, VIDRL, At the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia
World Health Organization Collaborating Centre for Reference and Research on Influenza, Chinese National Influenza Center, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, 155 Changbai Road, Changping District, Beijing 102206, China