1. Victorian Infectious Disease Service, The Royal Melbourne Hospital, Melbourne, Victoria, Australia
2. Doherty Department University of Melbourne, Peter Doherty Institute for Infection and Immunity, Victoria, Australia
3. Menzies School of Health Research, Darwin, Northern Territory, Australia
4. Department of Neurosurgery, The Royal Melbourne Hospital, Melbourne, Victoria, Australia
5. Department of Surgery, University of Melbourne, Melbourne, Victoria, Australia