1. Service of Neurology, Department of Clinical Neurosciences Lausanne University Hospital and University of Lausanne Lausanne
2. The Edmond J Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital & University of Toronto Toronto Ontario
3. Department of Neurology University of Colorado School of Medicine Aurora Colorado USA
4. Department of Neurosurgery University of Colorado School of Medicine Aurora Colorado USA
5. Department of Internal Medicine Universidade Federal de Minas Gerais Belo Horizonte Brazil
6. Department of Neurology Universidade de Sao Paulo Sao Paulo Brazil
7. Hospital Israelita Albert Einstein Sao Paulo Brazil
8. Department of Neurology Massachusetts General Hospital Boston Massachusetts USA
9. Department of Neurology and Neurosurgery Universidade Federal de Sao Paulo Sao Paulo Brazil