1. SAEFVIC, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, VIC.
2. Department of Paediatrics, University of Melbourne, Melbourne, VIC.
3. Infectious Diseases Unit and Immunisation Service, Department of General Medicine, Royal Children's Hospital, Melbourne, VIC.
4. Victorian Department of Human Services, Melbourne, VIC.
5. National Centre for Epidemiology and Population Health, Australian National University, Canberra, ACT.
6. Department of Paediatric Neurology, Monash Medical Centre, Melbourne, VIC.