1. Centre for Primary Care and Public Health Queen Mary University of London London UK
2. Department of Medical Statistics London School of Hygiene and Tropical Medicine London UK
3. School of Public Health Imperial College London London UK
4. Campus Fryslân University of Groningen Leeuwarden the Netherlands
5. Research Group Institute of Occupational Medicine Edinburgh UK
6. Centre for Occupational and Environmental Health University of Manchester Manchester UK
7. Rugby Football Union London UK
8. Dementia Research Centre UCL Queen Square Institute of Neurology London UK
9. Department of Health for Keith Stokes and Madeleine Davies Department of Psychology for Catherine Hobbs University of Bath Bath UK
10. Centre for Sport, Exercise & Osteoarthritis Research Versus Arthritis University of Oxford Oxford UK
11. Blizard Institute Queen Mary University of London London UK
12. Institute of Sport Exercise and Health University College London London UK
13. Premiership Rugby London UK
14. UK Dementia Research Institute UCL Queen Square Institute of Neurology London UK
15. UK Dementia Research Institute University College London London UK
16. Department of Psychiatry and Neurochemistry Institute of Neuroscience and Physiology the Sahlgrenska Academy at the University of Gothenburg Mölndal Sweden
17. Clinical Neurochemistry Laboratory Sahlgrenska University Hospital Mölndal Sweden