1. Neurosciences Research Centre, Molecular and Clinical Sciences Institute, St. George’s University of London, London SW17 0RE, UK
2. Departamento de Medicina, Universidad Autónoma de Barcelona (UAB), 08193 Barcelona, Spain
3. Neurology Unit, Movement Disorders Division, Department of Neurosciences Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy
4. Department of Clinical and Basic Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London SE5 8AF, UK
5. Dipartimento di Medicina Clinica e Sperimentale, University of Messina, 98122 Messina, Italy