1. Morton and Gloria Shulman Movement Disorders Centre and the Edmond J. Safra Program in Parkinson's Research, Toronto Western Hospital; University of Toronto
2. Barrow Neurological Institute; Phoenix AZ
3. Movement Disorders Unit, Neurology Department, Sant Pau Hospital (IIB Sant-Pau); Autonomous University of Barcelona and Networking Research Center on Neurodegenerative Diseases (CIBERNED); Spain
4. Department of Neurological Sciences; Rush University Medical Center Chicago; IL