1. Departments of Neurosurgery, Royal North Shore Hospital, St. Leonards, New South Wales, Australia,
2. Neurology, Royal North Shore Hospital, St. Leonards, New South Wales, Australia,
3. Department of Neurosurgery, Waikato Hospital, Hamilton, New Zealand,
4. Department of Radiology, Royal North Shore Hospital, St. Leonards, New South Wales, Australia,
5. Department of Radiology, Children’s Hospital, Westmead,
6. Department of Neurosurgery, John Hunter Hospital, New Lambton Heights, New South Wales, Australia.