1. School of Public Health and Community Medicine, University of New South Wales, Sydney, Australia
2. National Centre for Immunisation Research and Surveillance and University of Sydney, Australia
3. Discipline of Child and Adolescent Health, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
4. Sax Institute, Sydney, Australia
5. University of Technology, Sydney, Australia
6. Health Protection, New South Wales Ministry of Health, Sydney, New South Wales, Australia
7. Kirby Institute, University of New South Wales, Sydney New South Wales,, Australia
8. Department of Women’s and Children’s Health, University of Otago, Dunedin, New Zealand