1. Sobell Department of Motor Neuroscience and Movement Disorders University College London Institute of Neurology London UK
2. Department of Neurology and Psychiatry Sapienza, University of Rome Rome Italy
3. Department of Neurology Philipps University Marburg Germany
4. Parkinson's Disease and Movement Disorders Department HYGEIA Hospital Athens Greece
5. Department of Neurology Fatebenefratelli Hospital ASST Fatebenefratelli Sacco Milan Italy
6. Department of Neurology University Hospital Heidelberg Heidelberg Germany
7. Department of Clinical Neuroscience University College London Institute of Neurology London UK
8. Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Neuromed Pozzilli Italy