1. Rehabilitation, Ageing and Independent Living (RAIL) Research Centre, School of Primary and Allied Health Care, Monash University, Frankston 3199, Australia
2. Vaccine Uptake Group, Murdoch Children’s Research Institute, Melbourne 3052, Australia
3. Department of General Medicine, The Royal Children’s Hospital, Melbourne 3052, Australia
4. Department of Paediatrics, School of Population and Global Health, The University of Melbourne, Melbourne 3052, Australia
5. School of Health and Social Development, Deakin University, Burwood 3125, Australia
6. Infection and Immunity, Murdoch Children’s Research Institute, Melbourne 3052, Australia
7. Health and Social Care Economics Group, Caring Futures Institute, Flinders University, Adelaide 5001, Australia
8. Clinical Epidemiology and Biostatistics Unit, Murdoch Children’s Research Institute, Melbourne 3052, Australia
9. RCH National Child Health Poll, The Royal Children’s Hospital, Melbourne 3052, Australia
10. Department of Paediatrics, The University of Melbourne, Melbourne 3052, Australia