1. Department of Neurosurgery, The Royal Melbourne Hospital, Parkville, Victoria;
2. Department of Surgery, University of Melbourne, Parkville, Victoria;
3. Department of Neurosurgery, St George Hospital, Kogarah, New South Wales;
4. Faculty of Medicine, University of New South Wales, Kensington, New South Wales; and
5. Neurosurgical Society of Australasia, Melbourne, Victoria, Australia