Department of Neurology, Royal Free Hospital NHS Trust, London, UK. Department of Neuroscience, Monash University, Melbourne, VIC, Australia. Department of Neurology, St. Josef Hospital, Ruhr-University Bochum, Bochum, Germany. Preventive Neurology Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK/Department of Neurology, Royal London Hospital, Barts Health NHS Trust, London, UK.