1. The Royal Melbourne Hospital, Parkville, VIC, Australia
2. Department of Neurosurgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
3. Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
4. Division of Ophthalmology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
5. Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
6. Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA