1. Nuffield Department of Medicine; Centre for Tropical Medicine and Global Health; University of Oxford; Oxford UK
2. WHO Collaborating Centre for Reference and Research on Influenza; at the Peter Doherty Institute for Infectious Diseases; Melbourne Australia
3. WHO Collaborating Centre for Infectious Disease Epidemiology and Control; School of Public Health; Li Ka Shing Faculty of Medicine; The University of Hong Kong; Hong Kong Special Administrative Region China
4. National Institute for Biological Standards and Control; Medicines and Healthcare products Regulatory Agency; Potters Bar UK
5. Influenza Division, National Center for Immunization and Respiratory Diseases; Centers for Disease Control and Prevention; Atlanta GA USA
6. Armed Forces Health Surveillance Center (AFHSC) and Cherokee Nation Technology Solutions, Inc; Silver Spring MD USA
7. Center for Global Health; Institut Pasteur; Paris France