1. Parkinson's Disease and Movement Disorders Unit, Institut Clínic de Neurociències Hospital Clinic de Barcelona Barcelona Spain
2. Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders: Clinical and Experimental Research, Institut d'Investigacions Biomèdiques August Pi i Sunyer University of Barcelona Barcelona Spain
3. Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED) Barcelona Spain
4. The National CJD Research & Surveillance Unit, Centre for Clinical Brain Sciences University of Edinburgh Edinburgh United Kingdom