1. School of Computer Science and Software Engineering University of Western Australia Perth WA Australia
2. World Health Organization (WHO) Collaborating Centre for Reference and Research on Influenza Melbourne Vic. Australia
3. Centre for Respiratory Disease and Meningitis National Institute for Communicable Diseases Johannesburg South Africa
4. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt) Faculty of Health Science School of Public Health University of the Witwatersrand Johannesburg South Africa
5. Faculty of Health Science School of Public Health University of the Witwatersrand Johannesburg South Africa