[1] Univ Toronto, Toronto Western Hosp, Movement Disorders Ctr, Toronto, ON, Canada
[2] Univ Fed Sao Paulo, Escola Paulista Med, Dept Neurol & Neurosurg, Sao Paulo, SP, Brazil
[3] Baylor Coll Med, Dept Neurol, Houston, TX 77030 USA
[4] Univ Fed Parana, Hosp Clin, Neuroinfect Outclin, Virol Lab,Med Pathol Dept, Curitiba, Parana, Brazil
[5] Univ Fed Minas Gerais, Hosp Clin, Movement Disorders Unit, Neurol Serv,Internal Med Dept, Belo Horizonte, MG, Brazil
[6] Univ Fed Parana, Hosp Clin, Movement Disorders Unit, Neurol Serv,Internal Med Dept, Curitiba, Parana, Brazil