1. Movement Disorders Clinic, Neuroscience Department Hospital Universitario CEMIC, Centro de Educación Médica e Investigaciones Clínicas “Norberto Quirno” Buenos Aires Argentina
2. Morton and Gloria Shulman Movement Disorder Unit & E.J. Safra Parkinson Disease Program, Division of Neurology/Department of Medicine Toronto Western Hospital, University Health Network Toronto ON Canada
3. Department of Neurology and Movement Disorder Center Seoul National University Hospital Seoul Korea