1. Department of General Medicine, The Children’s Hospital at Westmead , Westmead, New South Wales , Australia
2. Australian Paediatric Surveillance Unit, Kids Research, Sydney Children’s Hospitals Network , Westmead, New South Wales , Australia
3. Faculty of Medicine and Health, The University of Sydney , Sydney, New South Wales , Australia
4. Australian Institute of Health Innovation, National Health and Medical Research Council Partnership Centre for Health System Sustainability, Macquarie University , Sydney, New South Wales , Australia
5. Central Queensland Hospital and Health Service , Rockhampton, Queensland , Australia
6. Research Division, Central Queensland University , Queensland , Australia
7. Department of Intensive Care Medicine, The Children’s Hospital at Westmead , Westmead, New South Wales , Australia
8. Kids Critical Care Research, The Children’s Hospital at Westmead , Westmead, New South Wales , Australia
9. National Centre for Immunisation Research and Surveillance, The Children’s Hospital at Westmead , Westmead, New South Wales , Australia
10. Department of Infectious Diseases and Microbiology, The Children’s Hospital at Westmead , Westmead, New South Wales , Australia