1. School of Population and Global Health, The University of Melbourne, Melbourne, Australia.
2. Victorian Government Department of Health, Melbourne, Australia.
3. Victorian Government Department of Jobs, Precincts and Regions, Melbourne, Australia.
4. WHO Collaborating Centre for Reference and Research on Influenza, Royal Melbourne Hospital, and Department of Infectious Diseases, The University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia.