1. Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, UK
2. Medical Genetics Section, Centre for Genomic and Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh, UK
3. Medical Research Council Integrative Epidemiology Unit, University of Bristol, UK
4. The National Institute on Aging, NIH, Baltimore, Maryland
5. Human Genetics, David Geffen School of Medicine, University of California Los Angeles
6. Department of Biostatistics, School of Public Health, University of California Los Angeles
7. Geriatric Unit, Azienda Sanitaria di Firenze, Florence, Italy
8. UCL Cancer Institute, University College London, UK
9. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
10. Department of Psychology, University of Edinburgh, UK