1. Department of Medicine, Surgery and Dentistry “Scuola Medica Salernitana”, Neuroscience Section University of Salerno Baronissi Italy
2. Edmond J. Safra Program in Parkinson's Disease Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, UHN Toronto Ontario Canada
3. Division of Neurology University of Toronto Toronto Ontario Canada
4. Krembil Brain Institute Toronto Ontario Canada
5. Department of Clinical and Movement Neurosciences University College London London United Kingdom