1 Perth Children's Hospital, Child and Adolescent Health Service, Nedlands, Western Australia, Australia.
2 UWA Medical School, Nedlands, Western Australia, Australia.
3 Healthy Skin and Acute Rheumatic Fever Prevention Team, Wesfarmers Centre for Vaccines and Infectious Diseases, The Kids Research Institute Australia, Nedlands, Western Australia, Australia.
4 Fiona Stanley Hospital, South Metropolitan Health Service, Murdoch, Western Australia, Australia.