[1] Cardinal St Med Ctr, Dept Internal Med, Sect Adult Neurol, San Juan, Philippines
[2] Univ East Ramon Magsaysay Mem Med Ctr, Dept Clin Neurosci, Sect Neurol, Quezon City, Philippines
[3] St Lukes Med Ctr, Dept Neurosci, Movement Disorders Serv, Sect Neurol, Taguig, Philippines
[4] Univ Philippines Manila, Philippine Gen Hosp, Coll Med, Dept Neurosci, Manila, Philippines
[5] Univ Philippines Manila, Coll Med, Dept Clin Epidemiol, Manila, Philippines
[6] Univ Toronto, St Michaels Hosp, Dept Neurol, Toronto, ON, Canada