1. Department of Neurology, The Canberra Hospital, Canberra, Australian Capital Territory, Australia
2. Department of Ophthalmology, The Canberra Hospital, Canberra, Australian Capital Territory, Australia
3. Australian National University Medical School, Canberra, Australian Capital Territory, Australia
4. Department of Medical Imaging, The Canberra Hospital, Canberra, Australian Capital Territory, Australia.