National Centre for Immunisation Research and Surveillance, University of Tasmania - Menzies Institute for Medical Research, National Centre for Immunisation Research and Surveillance, National Centre for Immunisation Research and Surveillance, The University of Sydney - Sydney Medical School, The University of Sydney - Discipline of Child and Adolescent Health, National Centre for Immunisation Research and Surveillance, The University of Sydney - Sydney Medical School, The University of Sydney - Sydney Medical School, The University of Sydney - Faculty of Medicine and Health, Al Jalila Children Specialty Hospital, Central Queensland Hospital and Health Service - Central Queensland Public Health Unit, The University of Sydney - Sydney Medical School, The University of Sydney - Sydney Medical School, National Centre for Immunisation Research and Surveillance, Hamad Medical Corporation, University of Sydney - National Centre for Immunisation Research and Surveillance and National Centre for Immunisation Research and Surveillance