Mark J Edwards, Eleanor Peel Chair for the Study of Aging, Professor of Neurology, St George's University, London, UK, Maria Stamelou, Assistant Professor of Neurology, Second Department of Neurology, University of Athens, and Hygeia Hospital, Athens, Greece, Niall Quinn, Emeritus Professor ofClinical Neurology and Honorary Consultant Neurologist, The National Hospital for Neurology and Neurosurgery, London, UK, Kailash P Bhatia, Professor of Clinical Neurology and Honorary Consultant Neurologist, Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London