1. Department of Radiology, Royal Melbourne Hospital, Australia (J.C.L., R.J.D., P.J.M.).
2. Melbourne Medical School (L.C.), University of Melbourne, Parkville, Australia.
3. Department of Medicine and Neurology, Melbourne Brain Centre at the Royal Melbourne Hospital (A.B., H.M., B.C.V.C., M.W.P., S.M.D., G.A.D., B.Y.), University of Melbourne, Parkville, Australia.