1. UCL Queen Square Institute of Neurology Department of Clinical and Movement Neurosciences London United Kingdom
2. Unidad de Trastornos del Movimiento, Servicio de Neurología y Neurofisiología ClínicaInstituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla Seville Spain
3. Centro de Investigación Biomédica en Red Enfermedades Neurodegenerativas (CIBERNED) Spain
4. Department of Human NeurosciencesSapienza University of Rome Italy
5. Division of Movement Disorders, Department of NeurologyColumbia University Medical Center New York NY USA
6. Department of NeurologyUniversity Hospital Heidelberg Heidelberg Germany