1. Dementia Research Centre, Department of Neurodegenerative Disease, University College London Queen Square Institute of Neurology, London, United Kingdom
2. Department of Medical Statistics, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
3. Preventive Neurology Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, United Kingdom
4. University College London Ear Institute and University College London Hospitals Biomedical Research Centre, National Institute for Health Research, London, United Kingdom