1. From Departments of Neurology (K.B., L.A., S.D.) and Radiology (B.T.), Royal Melbourne Hospital, University of Melbourne, Melbourne Australia; Department of Neurology (S.B.L.), Catholic University of Korea, Seoul, South Korea; Department of Neurology (M.P.), John Hunter Hospital, Newcastle, Australia; Department of Neurology (J.F.), Christchurch Hospital, Christchurch, New Zealand; Department of Neurology (G.D.), Austin Hospital, Melbourne, Australia.