[1] Univ Fed Sao Paulo, Dept Neurol, Div Gen Neurol, Sao Paulo, SP, Brazil
[2] Univ Fed Sao Paulo, Dept Neurol, Ataxia Unit, Sao Paulo, SP, Brazil
[3] Univ Cincinnati, Gardner Ctr Parkinsons Dis & Movement Disorders, Gardner Neurosci Inst, Cincinnati, OH 45221 USA