Affiliations

• ¹ Robinson Research Institute and Adelaide Medical School, The University of Adelaide, Adelaide, SA, Australia; Women's and Children's Hospital, Women's and Children's Health Network, Adelaide, SA 5006, Australia. Electronic address: helen.marshall@adelaide.edu.au.
• ² National Centre for Immunisation Research and Surveillance, Sydney Children's Hospitals Network, Sydney, NSW, Australia; The Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia.