1. School of Social and Community Medicine, Faculty of Medicine and Dentistry, University of Bristol, Canynge Hall, Bristol, UK
2. MRC Centre for Causal Analysis in Translational Epidemiology (CAiTE), University of Bristol, Oakfield House, Bristol, UK
3. Dementia Research Group, School of Clinical Sciences, Faculty of Medicine and Dentistry, University of Bristol, John James Laboratories, Frenchay Hospital, Bristol, UK