[1] Royal Victorian Eye & Ear Hosp, Balance Disorders & Ataxia Serv, Melbourne, Vic, Australia
[2] Florey Inst Neurosci & Mental Hlth, Melbourne, Vic, Australia
[3] Dizzy Day Clin, Melbourne, Vic, Australia
[4] Royal Melbourne Hosp, Dept Neurosurg, Melbourne, Vic, Australia
[5] Univ Melbourne, Dept Surg, Melbourne, Vic, Australia
[6] St Vincents Hosp, Dept Med Imaging, Melbourne, Vic, Australia
[7] Alfred Hlth, Neurosci Dept, Cerebellar Ataxia Clin, Melbourne, Vic, Australia